https://www.whitehouse.gov/presidential-actions/executive-order-ordering-selected-reserve-armed-forces-active-duty/
As usual Colbert is twisting the facts. The war in S. Vietnam was in full swing by the frenchies during the 50's, JFK sent 200 observers and after he was whacked our good friend LBJ ramped it up and it lasted until tricky dick took over and pulled out. So for the USA about 12-15 years involved in that mess against mostly red china sojas.
After pulling out Military was cleaned up and outed all the drug runners and corrupt POS. Then Reagan knew he had a green armed forces so the invasion of Grenada was a practice run to blood the troops.
4-6% lost forever.. Just throw them to China or Russia so they can experience the beauty of communism directly