The Vietnam war ended on April 30, 1975. Many of the photographs that came out of that war are still etched in our minds

In this March 1965 file photo, hovering U.S. Army helicopters pour machine gun fire into a tree line to cover the advance of South Vietnamese ground troops in an attack on a Viet Cong camp 18 miles north of Tay Ninh, northwest of Saigon near the Cambodian border, in Vietnam. (AP Photo/Horst Faas