Can you get an Air Force medical waiver if you are below minimum weight?

If you're below the Air Force's minimum weight but you're healthy enough to enlist otherwise, enroll in a gym on a mass- and strength-building program.

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no, because the air force has more then enough recruits that do meet their standards. The army has way too few so they are more willing to work with people. you would have to get up to the weight in a year if you did get a waiver.