The apartment building at 22 Ly Tu Trong Street, formerly known as 22 Gia Long Street, is located in Ho Chi Minh City, the largest city in Vietnam. Ho Chi Minh City is also known as Saigon. In 1975, during the Fall of Saigon, the final significant battle of the Vietnam War, photojournalist Hubert van Es, reporting for UPI, caught this famous image of US government officials fleeing the city by helicopter. Operation Frequent Wind was the cover name for the evacuation.