Is the Universal Military and Training Act of 1951 a part of the military armed forces in force today?

The Universal Military Training and Service Act of 1951 was a U.S. law that mandated military service for young men, but it has not been in effect since it expired in 1973. While the act was significant during the Cold War era, the U.S. military currently operates under an all-volunteer force. Today, there is no mandatory military service, although men are still required to register for the Selective Service System.