I'm in ROTC too (MSII), ABN date 30JUN to 26JUL. One piece of advice that everyone gave me: FEET AND KNEES TOGETHER, ALWAYS. Do not reach for the ground.
The flexed arm hang: You do a chin up, keep your legs straight. keep your chin above the bar for 10 seconds. you cannot kick or any other sort of method to keep your chin from touching the bar except to keep your arms in the flexed position.
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