Medical Aspects of Chemical Warfare (2008) - The Black Vault

Medical Aspects of Chemical Warfaremedium, and large. Optical inserts are provided forvision correction, and outserts are available to reducefogging and sun glare and to protect against scratching.A check valve on the nose cup prevents exhaledair from fogging the lenses inside, and an air deflectordirects inhaled air over the lenses, which also helpsprevent fogging. 14,15 Other components include a carrier,a waterproof bag, and a quick-doff hood to protectthe neck and head areas (Figure 17-7). 16 The quick-doffhood is not used when the mask is worn with parkaovergarments.M42A2 Chemical-Biological Combat Vehicle MaskThe M42A2 CB mask, in the same series as theM40A1, is used by combat vehicle crews (Figure 17-8).The materials of construction and the basic featuresare identical to the M40A1. Filtration is provided bya C2A1 canister attached to the mask by a corrugatedhose; the canister is housed in a specially designedcanister carrier. The M42A2 integrates with the combatvehicle filtration protection system. The M42A2 alsohas a dynamic microphone that integrates with thecombat vehicle via a microphone cable. 14,15,17MCU-2/P Chemical-Biological MaskThe MCU-2/P CB mask is used by US Air ForceFig. 17-8. The M42A2 chemical-biological field mask.Photograph: Courtesy of the Chemical Casualty Care Division,US Army Medical Research Institute of ChemicalDefense, Aberdeen Proving Ground, Md.ground crews and air crews when not in flight, and alsoby the Navy onboard ship for CBR defense. This maskhas a facepiece constructed of molded silicone rubbermaterial, and an integral, molded, polyurethane,one-piece panoramic lens bonded to the facepiece.Filtration is provided by one C2A1 canister mountedon either side of the facepiece. The primary voicemitteris located over the mouth area; a secondary voicemitterin the cheek area can be used with telephone handsets.The mask incorporates a drinking tube, whichconnects to the M1 canteen cap for hydration whilewearing the mask. The mask has a six-point, adjustablehead harness suspension made of elastic, whichcomes together in the center in the back of the headinto a rectangular patch of woven material. The maskcomes in three sizes: small, medium, and large. Accessoriesinclude a carrier bag, a butyl-coated nylon clothhood, a large outsert to protect the lens in storage, aneutral gray outsert to protect against sun glare, anda waterproof bag. 14,15M45 Chemical-Biological MaskFig. 17-7. The M40A1 chemical-biological field mask withthe quick-doff hood.Photograph: Courtesy of the Chemical Casualty CareDivision, US Army Medical Research Institute of ChemicalDefense, Aberdeen Proving Ground, Md.The M45 mask consists of close-fitting eye lensesshaped to improve peripheral vision and compatiblewith most optical sighting and night-vision devices;vision-corrective inserts that can be fitted inside thefacepiece; front and side voicemitters for face-to-faceand telephone communication; a low profile canister566