Context : Trần Văn Bảy was a Private First Class of the Army of the Republic of Vietnam and is one of only two South Vietnamese, and the only South Vietnamese Army member, to receive the Navy Cross for actions on February 19, 1967 during the Vietnam War (the other being Nguyễn Văn Kiệt). 
Question : Which conflict was Trần Văn Bảy a part of?
Vietnam War