Territorial defense is arguably the most important duty of any government. And that's why countries invest tons of money and other resources to beef up the strength and capacity of their armed forces.
The United States of America boasts the world's strongest and most funded military. With a massive budget of $740 billion, the world power maintains its lead at the top of the pack.
Russia's military has been a force to be reckoned with since the Soviet era. The transcontinental country is the largest by landmass worldwide and second behind the U.S. in military strength.
India is the second-most populous country and has one of the strongest militaries. Due to its massive human resource, the military has about 5 million officers; 1.4 million are on active duty.