Infantry trainees at Fort Polk, Louisiana, in 1966 wait for a mock ambush. More soldiers were shipped to Vietnam from Fort Polk than from any other American training base. (Lynn Pelham/The Life Picture Collection/Getty Images
Infantry trainees at Fort Polk, Louisiana, in 1966 wait for a mock ambush. More soldiers were shipped to Vietnam from Fort Polk than from any other American training base. (Lynn Pelham/The Life Picture Collection/Getty Images