Technical Manual (TM 3-4240-204-25P) M9A1 Protective Field Mask
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Technical Manual (TM 3-4240-204-25P) M9A1 Protective Field Mask
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This TM 3-4240-204-25P technical manual covers the M9A1 Protective Field Mask and is dated February 1963. It applies to the FSN range 4240-368-6093 through 4240-368-6098, which corresponds to the different M9A1 mask sizes and left- or right-canister configurations. For collectors of U.S. Army technical manuals, Chemical Corps material, Cold War protective equipment, and military paper, this is a strong period reference tied to one of the Army’s best-known early Cold War protective masks.
The M9A1 was a U.S. field protective mask designed to protect the face, eyes, and respiratory tract against CBR agents, and period stock listings show it was issued in multiple size and handed-canister arrangements, including SR, SL, MR, ML, LR, and LL. The same stock records also identify the M11 canister as the canister used with the M9 series masks.
The M9A1 Protective Field Mask
The M9A1 belongs to the family of U.S. military field protective masks developed in the post-World War II and early Cold War period. Period Army documentation for the M9 and M9A1 shows that this mask series was already established by the late 1950s, and later Army NBC doctrine identified the M9A1 as a special purpose mask designed for use with the M3 toxicological agent protective hood. That gives this manual added historical interest because it ties directly to an important transitional generation of U.S. military protective equipment before later mask families replaced it.
For collectors, the M9A1 is especially significant because it sits between the older postwar mask designs and the later standardized Cold War mask systems that followed. It is one of the masks most closely associated with the 1950s and early Vietnam-era U.S. protective-equipment landscape.
What This Manual Covers
This listing is for TM 3-4240-204-25P, the technical manual associated with the M9 and M9A1 Protective Field Mask. Army publication indexes and later mask manuals specifically reference TM 3-4240-204-25P as part of the M9A1 documentation set. Based on its designation, it belongs to the technical support and maintenance-documentation side of Army literature rather than simple field familiarization.
In practical terms, a manual like this is especially relevant for:
- nomenclature and identification
- component and stock-number reference
- maintenance and support context
- archival and restoration research
- documenting the Army’s service-era literature for the M9A1 mask family
Historical Significance
The date February 1963 places this publication squarely in the Cold War period, when the U.S. military maintained extensive technical literature covering chemical defense, protective masks, and associated support equipment. Manuals like this reflect a period when Army documentation extended far beyond weapons and vehicles to include the systems required to keep personnel protected in contaminated environments.
For collectors and historians, this manual is especially relevant to subjects such as:
- Cold War U.S. Army technical manuals
- Chemical Corps and protective masks
- field protective equipment
- M9 and M9A1 mask history
- dated military technical publications
About This Manual
This listing is for TM 3-4240-204-25P for the M9A1 Protective Field Mask, dated February 1963, covering the mask family identified under FSN 4240-368-6093 through 4240-368-6098. Those FSNs correspond to the various size and left/right canister configurations of the M9A1.
It is especially well suited for:
- U.S. Army technical manual collections
- Chemical Corps and protective-equipment displays
- Cold War military paper collections
- museum exhibits on military field protection systems
- archive and research libraries focused on U.S. military technical publications
Because manuals were working documents, surviving examples are valued not only for their content, but also for their connection to real military issue, maintenance, and documentation practice.
Why This Manual Matters
Many military manuals focus on weapons, vehicles, or combat systems. This one documents the protective side of military readiness, specifically one of the Army’s recognized field mask systems. That makes it especially useful for collectors who want to preserve the broader technical and logistical picture of Cold War Army preparedness rather than only front-line hardware. The manual is also useful because it ties directly to a known FSN range and to one of the more recognizable U.S. field-mask families of the era.
For collectors, it is a solid stand-alone Cold War technical manual with a specialized subject focus. For researchers, it offers a useful reference point for Army protective-mask documentation and stock identification. For museums, it helps explain the paperwork and maintenance side of U.S. military protective equipment.
Ideal For
This manual is a strong fit for:
- U.S. Army technical manual collections
- Cold War Chemical Corps displays
- protective mask and field-equipment collections
- museum and archival reference libraries
- collectors of military paperwork and dated technical publications
Approx length 10", Approx width 8", Approx height .2", Approx weight .2lbs.
Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item's general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures.
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