Japan is at the bottom of the top 10 with a population capable of mustering an army of just under 54,000,000 soldiers. The nation makes up for its lack of manpower with 767 operational tanks and nearly 1,600 aircraft. However, it has only a single aircraft carrier, zero nuclear warheads and just 16 submarines. Japan is not a world leader in any of the categories, but they it does maintain a hefty budget of $49.1 billion in military spending.
South Korea
South Korea was ranked ninth on the list, far ahead of its northern brother who was ranked 35th (even though North Korea also happens to be the world leader in submarines with a whopping 78 listed as operational). South Korea has a population capable of mustering only 25,609,290 soldiers, smallest of any nation ranked in the top ten. It makes up for this with an arsenal of nearly 1,400 operational aircraft, 2,346 tanks, and 14 submarines. South Korea has no nuclear warheads or aircraft carriers and a modest military budget of $33.7 billion.