MIL-DTL-15024: Complete Guide to Types A–L (2026)

The U.S. Department of Defense spends roughly $20.6 billion per year managing corrosion on military equipment (GAO-19-39). The Navy share alone runs about $8 billion a year, more than half of the total DoD figure (Materials Performance / AMPP). Identification plates are the small-component end of that problem. A military data plate that fails after five years on a 30-year hull forces re-inspection, re-stamping and a paper trail that nobody wants.

MIL-DTL-15024 is the Department of Defense performance specification that solves this for the marking itself. It defines exactly how identification labels, plates, tags and bands must be built, tested and applied so that part numbers, serial numbers and UID data remain legible across decades of saltwater, hydraulic fluid and UV exposure.

This guide covers the current revision G (2018), the differences from legacy revision F (1997) and the ten construction Types (A through L, with I and K intentionally omitted) so that a procurement specialist, design engineer or compliance reviewer can pick the right plate construction in one sitting.

The Department of Defense itself has stated the problem plainly:

“We need more training and education for every individual associated with corrosion prevention and control. We want to develop a constituency that leverages positive change.”Daniel Dunmire, Director, DoD Corrosion Policy and Oversight Office (NDIA Systems Engineering Division, June 2015).

That training-and-prevention posture is the role MIL-DTL-15024 plays at the small-component level: it forces the identification layer of every piece of military equipment to outlast the corrosion problem.

What is MIL-DTL-15024?

MIL-DTL-15024 is a Department of Defense performance specification that establishes the physical characteristics, material requirements and testing standards for identification devices including plates, tags and bands used to mark military equipment. These identification devices display critical information such as nomenclature, part numbers, serial numbers, voltage specifications, manufacturer data and safety warnings on electrical, electronic and mechanical military equipment.

The specification ensures that UID (Unique Item Identification, per MIL-STD-130) labels remain legible and intact throughout the operational life of equipment, regardless of environmental conditions. From aircraft instrument panels to naval vessel systems, from ground vehicle components to weapon systems, MIL-DTL-15024 governs how military assets are permanently identified.

Current Version: MIL-DTL-15024G (2018)

Important: the current active specification is MIL-DTL-15024G, published March 3, 2018 (now 8 years in force as of 2026), which supersedes MIL-DTL-15024F (28 November 1997, superseded but still legally referenced in many active contracts). Many existing contracts and legacy equipment still reference revision F, so it pays to understand both versions.

Key differences between F and G:

• Type K removed: cable bands (Types K1 and K2) were eliminated in revision G. Projects still referencing K should default to Type G (foils, vinyl or polyester) for cable-band replacement.
• Type E expanded: now includes sublimation and digital printing methods (previously only screen or litho print).
• Type G broadened: expanded from adhesive-backed plates to include foils, vinyl and polyester labels.
• Updated test standards: references to current ASTM and MIL-STD versions.
• Enhanced environmental requirements: more rigorous testing protocols.

When each version applies:

Commercial adoption: use revision G for current best practices.

New contracts (post-2018): should specify MIL-DTL-15024G.

Legacy contracts: may reference MIL-DTL-15024F. Continue using the specified version.

Replacement parts: match the version specified in original equipment documentation.

Types of Identification Devices: A-L Classification

MIL-DTL-15024 defines ten types of identification devices (the spec deliberately skips I and removed K in revision G). Each type is optimized for specific materials, marking methods and environmental conditions.

Complete Type Breakdown

Why MIL-DTL-15024 Skips Type I (and What Happened to Type K)

The specification deliberately skips Type I. Type K was removed entirely in revision G. Both are common questions worth answering directly.

Type I is not used because the letter “I” is too easily confused with the digit “1” in contract documents, drawings and stamped plates. Military identification standards have skipped “I” for decades for the same reason that maritime hull numbers, vehicle identification numbers and aircraft tail codes skip it. If you see “Type I” referenced in older documentation, it is either a typo or a non-MIL-DTL-15024 specification.

Type K (cable bands) was eliminated in the 2018 revision G update because cable band identification is better handled by Type G (adhesive-backed foils, vinyl or polyester) or by separate cable-marking specifications. Active contracts still calling out Type K should default to Type G unless the contracting officer specifies otherwise.

Type Selection Guide

Spec Types Breakdown

For maximum durability (20+ years): Type H (photosensitive) or Type L (laser anodized aluminum).

For cost-effective solutions: Type B (mechanical engraving) or Type E (printing, interior only).

For corrosive environments: Type A (chemical etch), Type H (photosensitive) or Type L Class 1.

For curved or flexible mounting: Type G (adhesive foils, vinyl).

For traditional appearance: Type D (cast) or Type A (relief etched).

For hanging or cable identification: Type J (stamped tags).

Need help selecting the right type for your application? Contact our identification specialists for expert guidance on military specification labeling solutions.

When to Choose Type J (stamped tags)

Type J is the right answer when the identification has to hang from the part rather than mount onto it. Cable identification tags, removable asset tags for in-service equipment, valve tags and tag-along documentation tags are all Type J use cases.

Construction: plastic, aluminum or stainless steel, minimum 0.03″ thickness, with permanent stamped characters. The hole for the attachment ring or wire tie is part of the form factor. Type J tags are designed to be threaded onto cables, posts, valve handles or equipment loops.

Type J is the cheapest path to MIL-DTL-15024 compliance for inventory identification that does not need to live on a flat surface. It is also the only Type that explicitly contemplates a removable attachment.

Label Requirements, Specifications and Compliance

Understanding compliance requirements is critical for manufacturers and procurement professionals working with MIL-DTL-15024. Unlike commercial standards, military specifications demand rigorous documentation, testing and quality control.

Physical and Marking Requirements

Character size standards:

• General characters: minimum 3/32 inch (0.094″) height.
• Nomenclature (item name): minimum 3/16 inch (0.188″) height.
• Exception: labels smaller than Size 1 in the standard size table may have proportionally smaller characters.
• Legibility: must meet MIL-STD-1472 human engineering requirements.

Marking information: required data varies by application but typically includes nomenclature, part or model number, serial number, manufacturer identification code (CAGE), contract number, National Stock Number (NSN) when applicable (see DLA Federal Logistics Information System for current NSN assignments), Unique Identification (UID) per MIL-STD-130 when required, voltage and electrical specifications for electrical equipment, date of manufacture and safety warnings or operational instructions.

Color requirements: MIL-DTL-15024 specifies nine color styles using SAE AMS-STD-595 color standards.

Material requirements: all materials must be fungus resistant (tested per ASTM G21), non-flammable, compatible with the substrate surface, capable of withstanding the same environmental conditions as the equipment and free from materials that promote corrosion.

Compliance vs. Certification: What Manufacturers need

No formal certification required. Unlike some military specifications, MIL-DTL-15024 does not require third-party certification. Manufacturers must demonstrate compliance through documentation and testing.

Required compliance documentation:

• Certificate of Conformance (CoC): manufacturer’s declaration that products meet all specification requirements. Must include specification number, revision, contract number, lot information and traceability to materials and processes used. Signed by an authorized company representative.
• First Article Inspection (FAI): required when specified in contract documents. Complete dimensional, material and performance verification with a full test report. Government or customer approval before production begins. Typically required for new contracts or significant design changes.
• Quality control documentation: material certifications (ASTM compliance for metals and plastics), process control records, inspection records, test results when specified and traceability from raw materials through finished product.
• Test reports: when testing is specified in the contract, reports must reference specific test methods and standards, include pass or fail criteria with actual results and be performed by qualified testing facilities. Initial lot testing plus periodic retesting (typically every 6 months).

Common compliance mistakes to avoid:

• Using incorrect character sizes (too small for legibility requirements).
• Selecting the wrong color style for the application.
• Inadequate documentation of material traceability.
• Insufficient environmental testing.
• Missing required information elements on labels.
• Wrong type selection for environmental conditions.
• Inadequate quality control procedures.

Inspection and testing requirements

Sampling procedures follow ANSI/ASQ Z1.4 (formerly MIL-STD-105). Inspection Level III applies for examination from each lot; Inspection Level S-4 applies for testing when testing is required. A lot is defined as all labels of the same type, style and size delivered at one time.

Major defects that result in lot rejection:

• Finish failures (flaking, peeling, blistering, cracking, discoloration).
• Physical hazards (burrs, sharp edges, delamination).
• Incorrect colors.
• Illegibility or significant legibility reduction.
• Incorrect or missing information.
• Materials not as specified.
• Dimensions outside specification limits.

Testing frequency:

• Initial lot: full testing per Table IV of the specification.
• Periodic: every 6 months for ongoing production. Test sooner if any of these occur: material vendor change, manufacturing process change, repeat customer complaint, FAI rejection on a related contract.
• On-demand: when specified by contract or when design changes occur.

Environmental and Performance Testing

MIL-DTL-15024 labels must survive extreme conditions without degradation. The specification outlines rigorous testing protocols that vary by type and intended application.

Standard test requirements

1. Temperature cycling (MIL-STD-202, Method 107)

• Condition A: 3 cycles between temperature extremes.
• Condition B: 3 cycles with a different thermal profile.
• Purpose: verifies labels withstand thermal expansion and contraction.
• Required for: all metallic types (A, B, C, D, H, L) and specific non-metallic types.

2. Weather resistance (ASTM D7869)

• 7-day test: daylight with water spray and humidity cycle (most types).
• 30-day test: extended outdoor exposure simulation (higher durability types).
• Simulates multiple years of outdoor weathering and verifies UV resistance, water resistance, temperature cycling.

3. Abrasion resistance (ASTM D4060, Taber Abraser)

• 500 cycles: standard durability requirement.
• 4,000 cycles: enhanced durability for high-wear applications. Required for both Type H (photosensitive) and Type L (laser-generated) per MIL-DTL-15024G Table IV.
• Purpose: ensures marking withstands handling, cleaning and maintenance contact.
• Critical for all premium types on equipment subject to wear, cleaning or maintenance contact.

4. Salt spray corrosion (ASTM B117)

• 336 hours: continuous salt fog exposure (14 days).
• Purpose: simulates marine and coastal environmental corrosion.
• Required for metallic types intended for naval and marine applications.
• Critical for ships, submarines, coastal installations, offshore equipment.

5. Fluid resistance (MIL-STD-810, Method 504)

• Test fluids: cleaning compounds, hydraulic fluids, fuels, oils per contract.
• Exposure: immersion or contact per specified procedures.
• Purpose: ensures labels survive contact with operational fluids.
• Application-specific: test fluids selected based on equipment environment.

6. Flammability (MIL-HDBK-454, Guideline 3)

• Requirement: non-flammable materials only.
• Critical for aircraft, enclosed spaces and fire-sensitive applications.
• Note: Type F laminated plates must meet self-extinguishing requirements.

7. Fungus resistance (ASTM G21, as above)

• Requirement: visual reading of “0” (no fungal growth).
• Duration: 28 days exposure to fungal spores under optimal growth conditions.
• Required for non-metallic types (plastics, laminates).
• Critical for tropical deployments and high-humidity environments.

Which Tests Apply to Which Types?

Not all types require all tests. The specification’s Table IV defines requirements:

• Most rigorous testing: Type H (photosensitive) and Type L (laser-generated) metallic plates undergo all applicable tests including 4,000-cycle abrasion and 30-day weather testing.
• Moderate testing: Types A, B, C (metallic engraved and etched plates) require full testing except extended abrasion.
• Limited testing: Type E (printed plates) and Type F (laminated) have reduced testing since they are specified for protected environments only.
• Test exemptions: some tests apply only to metallic or non-metallic types (for example salt spray for metallic, fungus testing for non-metallic).

Materials and Manufacturing Methods

Approved Materials by Category

Metallic materials:

• Aluminum alloys (ASTM B209/B209M): lightweight, excellent corrosion resistance when anodized, most common for aircraft and aerospace.
• Brass (ASTM B36/B36M): traditional material, good corrosion resistance, excellent engraving characteristics.
• Stainless steel: maximum corrosion resistance, ideal for marine environments, higher cost.
• Bronze: cast plates, traditional applications, excellent longevity.

Non-metallic materials:

• Phenolic plastic (ASTM D709, Grade ES-1, ES-2 or ES-3): engraving, laminating, must be opaque and fungus-resistant.
• Polyester films: Type G labels, flexible, good chemical resistance.
• Vinyl films: Type G labels, conformable to curves, indoor and protected outdoor use.
• Acrylic laminates: Type F plates, multilayer construction, protected environments.

Coatings and finishes:

• Anodized coatings (MIL-A-8625F): Type II Class 1 (clear) or Class 2 (color), required for aluminum per GG-P-455.
• Paint and enamel fills: must be hard, durable, fungus-resistant with appropriate opacity.
• Protective overcoats: moisture-resistant clear coatings when required.

Adhesives:

• Pressure-sensitive (double-coated tape, transfer tape).
• Must be compatible with substrate and environment.
• Fungus-resistant formulations.
• Full-back coverage required (no spot adhesive).

Recycled materials acceptable: recycled, recovered or environmentally preferable materials may be used if they meet or exceed all operational and maintenance requirements.

Manufacturing Processes

Chemical etching (Type A): photoresist masking followed by acid etching creates permanent sunken or relief characters. Depth minimum 0.003″ for filled plates. Provides excellent durability and chemical resistance.

Mechanical engraving (Type B): computer-controlled or pantograph engraving removes material to create characters. Minimum depth 0.008″ ensures durability. Filled with contrasting color for visibility.

Photosensitive anodizing (Type H): the Metalphoto process integrates silver compounds into anodized aluminum through photographic exposure, creating images sealed beneath a clear anodic layer. The result is a plate that survives 1000°F exposure, 720-hour salt-spray testing per ASTM B117 and decades of outdoor weathering.

The most rigorous third-party test was conducted by the U.S. Naval Surface Warfare Center, Corona Division, in two phases (August 2011 and September 2012). Seventy-three label materials were submitted by manufacturers across industry; each was put through 38 laboratory tests simulating desert, marine and submarine operating environments. Metalphoto photosensitive anodized aluminum earned the highest possible score on 32 of the 33 tests for which it was evaluated, more top scores than any other label material in the study (IUID Environmental Survivability Testing Report Synopsis). That benchmark is why Type H is the default specification call-out for IUID label compliance across naval surface ships, the Abrams tank, the Bradley Fighting Vehicle and HMMWV families.

Laser marking (Type L): high-energy lasers create permanent marks by removing anodic coatings, ablating surface coatings, engraving into material or marking ceramic coatings. The four Type L classes correspond to four substrate types.

Type L Classes 1, 2, 3 and 4 Compared

Type L is the only construction in the MIL-DTL-15024 family that splits into four distinct classes, each tied to a different substrate. Picking the right class is more important than picking Type L itself.

Class 1: laser ablates the anodic layer of black-anodized aluminum (per MIL-A-8625F Type II Class 2) to expose silver-colored aluminum beneath. Best for outdoor exposure, marine and decades of legibility. Tested to 4,000-cycle abrasion per Table IV.

Class 2: laser ablates a coated aluminum surface (typically a painted or powder-coated finish) to reveal contrasting substrate. Best for indoor industrial equipment where Class 1 is overkill but cost matters.

Class 3: laser engraves into phenolic plastic (per ASTM D709, Grade ES-1, ES-2 or ES-3). Best for lightweight non-conductive interior plates and panel labels.

Class 4: laser marks a ceramic-bonded coating on stainless steel. Best for extreme temperature environments where aluminum-based options would deform.

For a marine or outdoor application, Class 1 is almost always the right answer. For interior panels, Class 2 or Class 3 is more economical without compromising the spec.

Digital and screen printing (Type E): modern printing technologies allow full-color graphics and complex layouts. Must be overcoated with protective clear film. Limited to protected interior environments due to lower durability.

Applications Across Military and Commercial Sectors

Military and defense applications

Aerospace:

• Aircraft instrumentation panels and control surfaces.
• Avionics equipment identification.
• Missile and munitions marking.
• Spacecraft systems (NASA uses MIL-DTL-15024 standards).
• Maintenance access panels and service instructions.
• Safety placards and warning labels.

Naval and marine:

• Surface ship system identification.
• Submarine interior and exterior equipment marking.
• Corrosion-resistant nameplates and labels for saltwater environments.
• Below-deck and topside applications.
• Damage control equipment marking.

Ground systems:

• Combat vehicles (tanks, armored personnel carriers).
• Tactical wheeled vehicles.
• Support and logistics equipment.
• Training systems and simulators.
• Field maintenance equipment.

Weapons systems:

• Fire control systems.
• Electronic warfare equipment.
• Communications systems.
• Power generation and distribution equipment.

Commercial and industrial adoption

Many commercial sectors adopt MIL-DTL-15024 standards for demanding applications:

Oil and gas: offshore platforms, refineries and pipelines use Type H plates for 20+ year identification in corrosive petrochemical environments.

Nuclear industry: reactor equipment labeling, safety-critical component identification where longevity and regulatory compliance are paramount.

Chemical processing: equipment exposed to aggressive chemicals, high temperatures and frequent cleaning.

Marine industry: commercial vessels, offshore installations, port equipment facing saltwater corrosion.

Heavy equipment: mining, construction and agricultural equipment requiring durable identification.

Utilities: power generation facilities, transmission equipment, substations where long-term identification reliability is critical.

Looking for military-specification identification solutions for your critical equipment? Explore MPC’s Metalphoto anodized aluminum nameplates meeting MIL-DTL-15024 Type H requirements for maximum durability.

Related military standards and specifications

MIL-DTL-15024 works in conjunction with other military standards to create a full identification system:

MIL-STD-130 (Identification Marking of U.S. Military Property): defines WHAT information must be marked and HOW it should be formatted, including Unique Identification (UID) requirements using 2D Data Matrix codes. MIL-DTL-15024 defines the physical label specifications that implement MIL-STD-130 requirements.

MIL-DTL-19834 (Metal Foil, Adhesive Backed): covers adhesive-backed metal foil identification plates, closely related to Type G labels in MIL-DTL-15024. Often used interchangeably depending on contract specifications.

GG-P-455 (Photographic, Photosensitive, Anodized Aluminum, linked above): the federal specification governing Type H photosensitive plates (Metalphoto). Defines the anodizing and photographic process requirements.

MIL-STD-1472 (Human Engineering): establishes legibility requirements including character sizing, spacing, contrast ratios and viewing distance considerations that affect label design.

MIL-STD-810 (Environmental Engineering): provides environmental test methods including Method 504 (fluid contamination) referenced in MIL-DTL-15024 testing requirements.

Acquisition and Procurement Guidelines

What Acquisition Documents Must Specify

When preparing contracts, purchase orders or statements of work for MIL-DTL-15024 labels, specify:

• Specification version: MIL-DTL-15024G (current) or F if required by legacy contract.
• Type of identification device: Type A through L based on application requirements.
• Required marking information: all data elements to appear on labels.
• Format and sequencing: layout, order and organization of information.
• Color style: Styles I through IX per application (electronic equipment defaults to Style II, black background with white characters).
• Dimensions: standard sizes from specification Table II or custom dimensions.
• Thickness requirements: if different from specification minimums.
• Mounting provisions: holes, adhesive backing or other attachment method.
• Material specifications: if specific materials are required beyond “contractor’s selection”.
• Testing requirements: whether testing is required and which tests.
• First Article Inspection: if FAI is required before production.
• Sampling and inspection: lot acceptance and rejection criteria.
• Packaging requirements: how labels should be packaged for delivery.

Example specification language:

“Identification plates shall conform to MIL-DTL-15024G, Type H, Style II, Size 10. Plates shall include the following information in the specified format: [list data elements]. First Article Inspection is required. Testing per specification Table IV shall be performed on initial lot and every six months thereafter.”

Contractor Responsibilities

Material selection: unless specifically mandated, contractors select materials that meet specification requirements for the intended environment and application.

Quality assurance: contractors must maintain quality systems capable of ensuring consistent compliance, with documented procedures for inspection, testing and nonconformance handling.

Documentation: contractors must provide Certificates of Conformance, test reports when applicable and maintain traceability records.

Design approval: when information plates (instructional or operational content) are required, contractors must submit proposed designs for customer approval before production.onal/operational content) are required, contractors must submit proposed designs for customer approval before production.

Final Thoughts on MIL-DTL-15024

MIL-DTL-15024 represents decades of military engineering refinement, creating identification solutions that survive the harshest operational environments: carrier deck saltwater spray, Arctic cold, jet engine heat. Understanding the distinction between revision F (1997) and current revision G (2018) ensures your labels meet contract requirements for both legacy and new defense programs.

With ten distinct types and rigorous testing protocols including 336-hour salt spray exposure and 4,000-cycle abrasion testing, the specification guarantees that critical equipment information remains legible throughout the entire service life of military assets.

Success with MIL-DTL-15024 hinges on three fundamentals: selecting the appropriate type for your environmental conditions, maintaining full compliance documentation and working with experienced suppliers who understand both technical specifications and military qualification processes.

Whether you are marking aircraft instrumentation, naval systems, ground vehicles or adopting mil-spec standards for commercial applications in oil and gas or marine industries, this specification provides the proven framework for identification that withstands decades of service while supporting mission readiness, maintenance efficiency and operational safety.

Frequently Asked Questions