United States vs. Iran?

I recently came across this handy and short piece by Stephen Walt, professor of International Affairs at Harvard. The whole post is interesting, but here’s the little set of data:

GDP: United States — 13.8 trillion
Iran –$ 359 billion  (U.S. GDP is roughly 38 times greater than Iran’s)

Defense spending (2008):
U.S. — $692 billion
Iran — $9.6 billion (U.S. defense budget is over 70 times larger than Iran)

Military personnel:
U.S.–1,580,255 active; 864,547 reserves (very well trained)
Iran–   525,000 active; 350,000 reserves (poorly trained)

Combat aircraft:
U.S. — 4,090 (includes USAF, USN, USMC and reserves)
Iran — 312 (serviceability questionable)

Main battle tanks:
U.S. — 6,251 (Army + Marine Corps)
Iran — 1,613 (serviceability questionable)

Navy:
U.S. — 11 aircraft carriers, 99 principal surface combatants, 71 submarines, 160 patrol boats, plus large auxiliary fleet
Iran — 6 principal surface combatants, 10 submarines, 146 patrol boats

Nuclear weapons:
U.S. — 2,702 deployed, >6,000 in reserve
Iran – Zero