There's only one real way to compare military strength, and thankfully the world hasn't had many opportunities lately. Despite the potential powder keg in the South China Sea, standoffs in Ukraine, and proxy wars throughout the Middle East, inter-state warfare between the world's military powers has been all but banished from the global scene (for the time being, at least). For a simpler evaluation of military power, we turned to the Global Firepower Index, a ranking of 106 nations based on more than 50 factors including overall military budget, available manpower, and the amount of equipment each country has in...