In his latest memoir, Homer recounts his life in college where he built the world's biggest, baddest game cannon, fought through some of the worst battles in Vietnam, became a scuba instructor, discovered sunken U-boats, wrote the definitive account of a World War II naval battle, befriended Tom Clancy, made a desperate attempt to save the passengers of a sunken river boat, trained the first Japanese astronauts, taught David Letterman to scuba dive,...