A CIA employee helps Vietnamese evacuees onto an Air America helicopter from the top of 22 Gia Long Street, near the US Embassy in Saigon, 1975. Photo: Bettmann/Getty Images/file photo.

A CIA employee helps Vietnamese evacuees onto an Air America helicopter from the top of 22 Gia Long Street, near the US Embassy in Saigon, 1975. Photo: Bettmann/Getty Images/file photo.