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M-4 Special Operation Medical Bag
These protective masks have inbuilt systems that facilitate communication, a tube for drinking water (A1 / A2), and a pair of outserts to protect eye lenses and prevent fogging. M17 - first .M17A1 - added drinking tube to consume water while wearing.
M17A2 - a smaller size was introduced, so they changed the name. that is the only difference. current issue. The drinking tube was added to the M17A1 in 1966. the name was changed to M17A2 in 1983. The drinking tube was around long before the A2 was.
Explanation of TEMPEST
ASCII standard
Crypto and cipher machines
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