I liked the "We won't f#$ up your head as bad as the marines". If there wasn't such an angry bent to most of them, it would be funny.
How about
:
1. Be all that you can be (except under UCMJ code 43, or where being all you can be would interfere with your mission or the needs of the united states military, or being all you can be requires money, or where being all you can be would be seen as offensive by ANYONE, or being all you can be includes running faster than others, or where being all you can be involves saying what you REALLY think, or in cases where "all you can be" refers to "ALL 500lbs of you", or in such instances as your chain of command deems it innapropriate for you to be all you can be.)
2. It's like college without the smart people!
3. Earn just enough money for beer and hoors!