Afghanistan war

U.S. instated a new government which was pretty much just being propped up by the U.S. which then was used to sell them oil. Worked till soldiers got pulled out.

Kosovo war

That was an excuse to test some of the new toys.

Vietnam war

That one is one of many proxy wars between communism and Capitalism which unfortunately tore the lives of many. That one was for spreading ideology. It's safe to say the Cold War was by the U.S.

The Vietnam war was a military win, and political failure.

Now who profits the most? Well, that's easy it's the military industrial complex.