ok, you are young enough to handle some risk, and you are realistic about losses. IMHO, it is too late to buy defense related equities, all that was done at 09:30 monday. for the short term, i would look at some "consumer cyclical" stocks: the super markets, the pharmacies, any industry that is vital, even in emergencies.
others made the good point of avoiding airline or air-anything related stocks, look at trucks and trains instead. super-high tech and surveillence stocks are good for the long haul too.
with all that said, i do work on wall street, but i cannot legally advise you, so take this FRIENDLY advice only if you choose.
a few more things, i would NEVER buy a share of stock, EVER...that's just me, and my partner, and most people i know here. land is the way, people have needed land since the beginning of time, and will need it forever. GUNS are a far better investment IMHO, and yes, there will DEFINATELY be war bonds!
hope this helps!