Technical Manual C2 (TM 3-4240-269-12) XM28E4 Riot Control Agent Mask
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Technical Manual C2 (TM 3-4240-269-12) XM28E4 Riot Control Mask
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This Technical Manual Change 2 for TM 3-4240-269-12 covers the XM28E4 Riot Control Agent Mask and is dated November 1968. This change was issued for the April 12, 1968 printing of the base manual, making it an important companion document for collectors, researchers, restorers, and anyone building a serious reference library around U.S. Army protective equipment and Cold War technical literature.
Unlike a full base manual, this item is an official Change 2 publication. That means it was issued to revise and update the original manual rather than replace it outright. For collectors, that matters. Army manuals were routinely kept current through numbered changes, and surviving change issues help document how technical guidance, maintenance information, and service procedures evolved while the equipment remained in use. In that sense, this is not just an insert. It is part of the actual service history of the manual.
The XM28E4 Riot Control Agent Mask
The XM28E4 belongs to the broader family of U.S. military protective masks and Chemical Corps support equipment. As identified by its nomenclature, it was a riot control agent mask, placing it in the category of specialized respiratory and face protection intended for environments involving riot control agents rather than conventional battlefield weapons systems.
The XM designation is especially important. In U.S. military nomenclature, that indicates an experimental or developmental item, which makes this manual particularly interesting from a historical standpoint. Instead of documenting only a standard, long-established service item, it preserves the technical record of a mask from the developmental side of Army protective-equipment history.
For collectors, that gives this manual added appeal. It connects Cold War protective equipment with the Army’s experimental and specialized support systems, making it more unusual than a manual for a common field mask.
What This Manual Change Covers
As an official Change 2 to TM 3-4240-269-12, this publication would have been intended to revise and update the service information associated with the XM28E4 Riot Control Agent Mask.
In practical terms, publications like this are especially relevant for:
- updated technical guidance
- revised operating or servicing information
- corrected maintenance procedures or data
- manual-issue history and documentation
- restoration and archival reference
- collecting complete service-era manual sets
Because it is Change 2, it is especially useful for collectors who want to pair it with the original base manual and preserve the manual as it was actually updated and used in service.
Historical Significance
The date November 1968 places this publication squarely in the Vietnam-era / Cold War period, when the U.S. military maintained extensive technical literature covering protective masks, chemical-defense equipment, riot-control systems, and other specialized support gear. Manuals and change sheets like this reflect a period when Army documentation extended far beyond weapons and vehicles to include the equipment required to support personnel in hazardous or controlled-agent environments.
For collectors and historians, this manual change is especially relevant to subjects such as:
- Cold War U.S. Army technical manuals
- Chemical Corps and protective equipment
- riot control agent protective masks
- experimental military support equipment
- dated military paperwork and manual changes
Because it covers an XM-designated mask rather than a more common field mask or weapon system, it also adds variety to collections that already include standard ordnance or maintenance manuals.
About This Item
This listing is for Technical Manual Change 2 for TM 3-4240-269-12 covering the XM28E4 Riot Control Agent Mask, dated November 1968. It was issued for the April 12, 1968 printing of the original technical manual.
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 support 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 training, maintenance, and support practice.
Why This Manual Matters
Many military manuals focus only on base editions, but change sheets are a major part of how Army documentation was actually maintained in service. This item adds a layer of authenticity and completeness that a base manual alone does not always provide.
For collectors, it is a useful companion piece to the original TM 3-4240-269-12. For researchers, it helps document the continued support history of the XM28E4 Riot Control Agent Mask. For museums, it adds context to the administrative and technical side of a specialized protective system that is far less commonly documented than standard combat equipment.
Ideal For
This manual is a strong fit for:
- U.S. Army technical manual collections
- Cold War Chemical Corps displays
- protective mask and respiratory-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.
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