how about some of these?
alea iacta est - the die is cast
animis opibusque parati - prepared in minds and resources (ready for anything)
audaces fortuna iuvat - fortune favours the bold
(the ever popular with some) carpe diem - seize the day
errare humanum est - to err is human
facta non verba - deeds, not words
fortes fortuna iuvat - fortune favours the brave
nulli secundus - second to none (I wonder where that came from :?: )
praemonitus pramunitus - forewarned, forearmed
victis honor - honour to the vanquished
veritas vos liberabit - the truth shall make you free
FIDO would be cool. "F*** It, Drive On". Rangerish, but applicable to every endeavor. After Mil-life, you will get hounded by every wannabe used car salesman and every waitress in America. Stand your ground, tell the pretty girls what it means, and enjoy. No matter your MOS, you will have to drive on. If you want a tat, make it one you can live with, because they do not go away.