James Robert "Bob" Kalsu (April 13, 1945 – July 21, 1970) was an All-American tackle at the University of Oklahoma and an eighth-round draft pick by the Buffalo Bills of the American Football League in 1968. Lieutenant Kalsu had one child, a daughter named Jill. At home in Oklahoma City, his wife, Jan Kalsu, gave birth to his son, James Robert Kalsu Jr., on July 23. Mrs. Kalsu was informed of her husband's death only hours later. Kalsu was the only recently active professional football player to lose his life in the Vietnam War.