Let me also provide some statistics with actual military significance:
manpower available:
http://www.globalfirepower.com/available-military-manpower.asp 1. China 2. India 3. USA
Active military personnel:
http://www.globalfirepower.com/active-military-manpower.asp 1. China 2. USA 3. India
Tanks:
http://www.globalfirepower.com/armor-tanks-total.asp 1. USA 2. China 3. North Korea
Armored fighting vehicles:
http://www.globalfirepower.com/armor-apc-total.asp 1. China 2. USA 3. Russia
Self propelled gun:
http://www.globalfirepower.com/armor-self-propelled-guns-total.asp 1. Russia 2. China 3. South Korea 4. USA
Towed artillery:
http://www.globalfirepower.com/armor-towed-artillery-total.asp 1. China 2. India 3. South Korea 11. USA
Multiple launch rocket system:
http://www.globalfirepower.com/armor-mlrs-total.asp 1. China 2. North Korea 3. Egypt 6. USA
Mortar systems:
http://www.globalfirepower.com/infantry-mortar-systems-total.asp 1. Egypt 2. China 3. Turkey 5. USA
Anti tank weapons:
http://www.globalfirepower.com/infantry-guided-antitank-systems-total.asp 1. India 2. Turkey 3. Jordan 6. USA
Logistical vehicles:
http://www.globalfirepower.com/armor-logistical-vehicles.asp 1. Russia 2. USA 3. China
Total military aircraft:
http://www.globalfirepower.com/aircraft-total.asp 1. USA 2. China 3. Russia
Total helicopters:
http://www.globalfirepower.com/aircraft-helicopters-total.asp 1. USA 2. Russia 3. China
Aircraft carriers:
http://www.globalfirepower.com/navy-aircraft-carriers.asp 1. USA 2. Italy 3. Eight other countries with 1 aircraft carrier
Frigates:
http://www.globalfirepower.com/navy-frigates.asp 1. China 2. Japan 3. USA
Destroyers:
http://www.globalfirepower.com/navy-destroyers.asp 1. USA 2. Japan 3. China
Corvettes:
http://www.globalfirepower.com/navy-corvettes.asp 1. Russia 2. India 3. Indonesia (USA doesn't have any corvettes)
Submarines:
http://www.globalfirepower.com/navy-submarines.asp 1. USA 2. North Korea 3. China
Coastal patrol:
http://www.globalfirepower.com/navy-patrol-coastal-craft.asp 1. North Korea 2. China 3. Iran 45. USA
Mine warfare crafts:
http://www.globalfirepower.com/navy-mine-warfare-craft.asp 1. Thailand 2. China 3. Russia 12. USA
amphibious assault craft:
http://www.globalfirepower.com/navy-amphibious-craft.asp North Korea 2. China 3. Sweden 7. USA
So to sum this up US has much manpower but not as much as some other big militaries. The land systems are the US weakest part but still strong. The US airforce is the most impressive. The US navy is based on mainly its very impressive carrier fleet supported by destroyers and submarines. This is also impressive but not as impressive as the air force but more impressive than the land systems.