Adams, a Pulitzer Prize-winning American photographer and photojournalist noted for his war coverage and portraits of celebrities and politicians, began his career as a combat photographer during the Korean War. His best known photograph, a harrowing image of the moment that South Vietnamese police chief Nguyen Ngoc Loan executed a Vietcong prisoner, Nguyen Van Lem, on a Saigon street in 1968, won the Pulitzer Prize. Why did he later apologize to the police chief for having taken the picture? Discuss