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A group of guys sitting around the barracks playing cards. The composition recalls the Renaissance masters, with a mysterious floating bag of Fiesta chips at the center. Above all the action, a poster (of Fearless Leader?) "Knows, Feels, Wills, Believes." Whoa.
The subject matter is a gay fantasy.
Given the sequence of images we know that immediately after the card game these men removed their uniforms and posed for the next photo. One can only assume they were playing strip poker.
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My only regret is this isn't a triple exposure.
P.S. To meet the needs of the Vietnam War, an Advanced Individual Training Infantry Brigade was activated in 1966. It was deactivated in April 1970, after training more than 30,000 men. Those were the days!