From the Washington Post:

Robert Poos, 78, who covered the Vietnam War as a reporter for the Associated Press and later was managing editor of Soldier of Fortune magazine, died Dec. 15 of chronic obstructive pulmonary disease at Mount Vernon Nursing and Rehabilitation Center in Alexandria.

Mr. Poos was a Marine during the Korean War and joined the AP in 1957. Assigned to the AP's Saigon, South Vietnam, bureau in 1965, he quickly became noted for aggressive and daring combat reporting.