You're gonna need to work on running and endurance. ROTC at any university has good PT. The major at my school had them in good shape. The running is gonna kill you though. You need to do 3 miles in 18:00 to be an exceptional cadet and that's hard as s***. They'll have you in good shape after 4 years, but you'd better get running or freshmen year is going to kill you.
I wouldn't worry about push-ups and pull-ups and that kind of thing...you will get a lot of it in school and basic. The running however is crazy, absolutely crazy.