1) America doenst have the money to play Empire anymore - I dont care whether you are right or left, your broke, and your military empire with hundeds of bases all over the world and retarded idea of full spectrum dominance is responsible for more than half your debt and deficit. The American Empire is finished, and we will likely be heading into a more multipolar world.
2) America has lost the war on terror. What good is a radar-invisible plane when your biggest threat (Terrorists) dont know what radar is?! America has city-vaporizing bombs, but their enemies live in caves. America spends trillions on the latest in technological weapons, but they cant defeat an enemy that uses old AKs, rocks, and little girls that strap bombs to their chests and run on crowded buses. Yes, terrorists dont fight fair, but when America has helicopters and nukes, you cant exactly expect them to line up with their muskets, now can you?
3) This trillion dollar oil raid into Iraq had fiasco written over it from the start (and, yes, we told you so), and now that it has alienated America's closest allies, made it hated around the world, resulted in disaster, ballooned the debt, killed thousands of innocent lives, and otherwise pulverized a developing nation. Most of all, it has been a terrorists wet dream - America has given terrorists more recruits than ever before, with extra motivation, while all your resources are bogged down in an unwinnable quagmire.
4) If war ever broke with Russia or China, the F-22 aint gonna make the difference, because you will be blasting one another with so many nukes that fighter jets will be irrelevant.
In short, America's military is obsolete, bloated, and useless in the age of nukes and terror.