A note on the JSF vs. F22: Firstly, to actually utilise the A-10 without it being blown out of the sky by any marauding MiG-21, you need air supremacy. Not even superiority - you need to ground every last enemy plane before you can start sending something that slow into enemy airspace.]
Secondly: On body armour, infantry weapons and other matters brought up by Vern - in part, I agree with you. However, the simple fact is that a superpower, such as the United States, can not look to merely the war that is in front of it, but must rather consider all other potential conflcits. Everybody claims that 'It's useless', when, in fact, the correct statement would be 'It is useless in the present situations in Afghanistan and Iraq'.
However, one cannot put all one's eggs in one basket, as it were. For example - those who favour the 'global nuclear war', theory - what would happen, if, say, tommorrow, someone were to develop an effective, easy and simply countermeasure to ICMB's? I'm not sure what, but let's say that the Russians, EU, China and the US all, simeltanteously, develop an anti-ballistic missile system that renders ballistic missile useless.
Oh, shit. Now, warfare is going to be decieded not by nukes, but by good, old-fashioned brutality. In short, the Raptor just went from being useless, to being an outright neccesity.
On the body armour - sadly, in Afghanistan and Iraq, body armour would not save our troops, mainly because the IEDs, mortars and RPG rounds the insurgents use put out so much shrapnel that it will either go through or bypass the armour via it's weak spots. Also, a 7.62mm rifle would be effective at long range, but would be a disadvantage in the short-ranged firefights our troops get into simply due to it's higher recoil during automatic fire.