Military power of USA & Japan
USA vs Japan
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USA is a country located in North America with an area of 9,857,306 km2 (land boundries: 12,002 km and costline 19,924 km). The capital of USA is Washington. The number of inhabitants is 331,449,281.
The United States is a member of NATO and was one of the original 12 countries to sign the North Atlantic Treaty in 1949. The US military's inventory is comprised almost entirely of domestically-produced weapons systems defense industry is capable of designing, developing, maintaining, and producing the full spectrum of weapons systems. The United States is the world's leading arms exporter.
More about USA militaryJapan is a country located in Eastern Asia with an area of 377,944 km2 (land boundries: 0 km and costline 29,751 km). The capital of Japan is Tokyo. The number of inhabitants is 125,360,000.
The current Self Defense Force was founded in 1954. Japan has Major Non-NATO Ally (MNNA) status with the USA. Approximately 55,000 US troops and other military assets, including aircraft and naval ships, were stationed in Japan and had exclusive use of more than 80 bases and facilities. In exchange for their use, the US guarantees Japan’s security. The JSDF is equipped with a mix of imported and domestically-produced equipment. The majority of its weapons imports are from the US and some domestically-produced weapons are US-origin and manufactured under license.
More about Japan militaryIf you want to check the comparison in terms of economic ratios check out CompareEconomy.com
Military expenditures
 US |  JP | |
|---|---|---|
| Military budget: | 816 billion $ | 53.1 billion $ |
| Percent of GDP: | 3.3% | 1.2% |
Manpower
| US | JP | |
|---|---|---|
| Active personnel: | 1,358,500 | 247,150 |
| Reserve personnel: | 799,500 | 56,100 |
| Available for military: | 73,270,043 | 27,301,443 |
Land Forces
| US | JP | ||
|---|---|---|---|
| Tanks: | 6,612 | 1,004 | |
| Armoured fighting vehicles: | 41,237 | 3,072 | |
| Total artillery: | 4,243 | 623 | |
| Self-propelled artillery: | 1,498 | 214 | |
| Rocket artillery: | 1,366 | 99 |
Air Forces
| US | JP | ||
|---|---|---|---|
| Total aircraft: | 12,930 | 1,444 | |
| Fighter aircraft: | 461 | 155 | |
| Multirole aircraft: | 2,417 | 79 | |
| Attack aircraft: | 566 | 0 | |
| Helicopters: | 4,741 | 698 | |
| UCAV (combat drone): | 334 | 0 |
Navy
| US | JP | ||
|---|---|---|---|
| Total naval: | 460 | 140 | |
| Aircraftcarriers: | 20 | 4 | |
| Destroyers: | 94 | 36 | |
| Frigates: | 0 | 2 | |
| Corvettes: | 22 | 6 | |
| Submarines: | 69 | 22 |
☢ Nuclear weapons
USA
The first country to develop and to military use nuclear warheads in the world. Everything started from the Manhattan project, a research that had one particular goal in focus – to develop and produce the first nuclear weapon. Americans were the first to wield such powerful weapon. Everything started in 1941, which is date of the beginning of Manhattan project. Since the end of the Second World War, United States became the leading country when it comes to possessing nuclear warheads and it lasted approximately to 1980s. We should also bear in mind that United States are also the only nation that ever used nuclear weapon in military conflict.
In 1960, the amount of warheads stored by Americans exceeded 30,000. However, it is worth to note that throughout the entire period of the so-called Cold War, USA managed to build approximately 70,000 nuclear warheads, what is more than all other countries with access to nuclear weapons combined. From the first test that happened in 1945 to this day, the USA conducted 1054 tests of atomic bombs. Still, as a result of introduced restrictions on the amount of warheads one state can possess, the current number has dropped to 6500 warheads. Noteworthy is also the fact that out of this number, United States deployed only 1600.
Japan
Does not have nuclear weapons.
Military service
USA
18 years of age (17 years of age with parental consent) for male and female voluntary service; no conscription; maximum enlistment age 42 (Army), 27 (Air Force), 34 (Navy), 28 (Marines); service obligation 8 years, including 2-5 years active duty (Army), 2 years active (Navy), 4 years active (Air Force, Marines); DoD is eliminating prohibitions restricting women from assignments in units smaller than brigades or near combat units.
Japan
18 years of age for voluntary military service; no conscription; mandatory retirement at age 53 for senior enlisted personnel and at 62 years for senior service officers.