PT in the Army for 17 - 21 yr olds passing consisted of: Back in '93 - '96
52 sit-ups in 2:00
42 sit-ups in 2:00
2 mile run under 15:54
Following those 3-rules from Trapps will work wonders:
In the Army you can be promoted to E2 prior to enlisting by recruting another recruit. I highly recommend you get your E2 prior to going in, why? a lot more money!