The first U.S. combat troops to arrive in Vietnam, a battalion from the 3rd Marine Division, come ashore at a beach north of Da Nang on March 8, 1965. (Bettmann/Getty Images)
The first U.S. combat troops to arrive in Vietnam, a battalion from the 3rd Marine Division, come ashore at a beach north of Da Nang on March 8, 1965. (Bettmann/Getty Images)