The last U.S. ground combat unit in South Vietnam, the Third Battalion, Twenty-First Infantry, departs for the United States. The unit had been guarding the U.S. air base at Da Nang. This left only 43,500 advisors, airmen, and support troops left in-country. This number did not include the sailors of the Seventh Fleet on station in the South China Sea or the air force personnel in Thailand and Guam.
1972