Labor on military base

I work for a pizza buisness that has franchises in wilmington, southport, jacksonville & camp lejeune. My job is cashier. My employer pays me 500.00 (I'm listed as salary) every two weeks. I am required to work 54 hours each week. I receive this pay from a check and from cash (this is so I won't have to pay taxes on it according to the owner). I was recently told that I qualified to receive benefits but that it would be double what the male employees had to pay because I was of "child bearing age". I feel like I'm being ripped off because we all are salary but they receive more in their checks and cash than I do, but we've been employed the same amount of time. shouldn't I be paid time and a half for the 14 hours a week overtime I work? Also since I'm salary can they dock my weekly pay if I'm 2 hours late due to a doctor's appt? I gave them 2 weeks notice about it. Is it true that because we work at the franchise on the military base they do not have to post or follow NC labor laws?