Conscription in the United States military — also known as "the draft" — ended with the Vietnam War. Today men and women serve because they want to, not because they have to, but it wasn't always that way.
Throughout history, when a country waged war and needed a large Army, it turned to drafting its people. The U.S. applied conscription as early as the Revolutionary War by drafting men into the militia and state Army units.
But every time a government turned to conscription, it stirred controversy, exposing fault lines of race, culture and social class. Some say it unifies the country, others argue it tears a society apart. Despite the all-volunteer force of the United States as an example of defense without conscription, there are many countries which still use a draft in 2015.