The military uses a wide range of planes, including ordinary 737's for routine deployments.
Massive planes like the C-130 and such are occasionally used for troop transport, however, you're more likely to see a civilian-style jet.
that said, if you want a distinctly military look, here's some:
C141:
http://www.militaryfactory.com/aircraft/imgs/c141.jpghttp://aboutfacts.net/Else/Else36/C-141.jpg737 Derivative: