Robert Wahlfeldt served in the United States Navy during World War II. He served in the engineering section on the U.S.S. Waldron, a destroyer. The ship traveled to Bermuda and the Panama Canal before going to the Pacific. By 1945 the ship was assigned to a fast carrier task force, and supported combat operations in and around the Philippine Islands, the South China Sea, and during the invasion of Okinawa. After the war he say Yokosuka, in Kanagawa province, Japan.