In this handout from the U.S. Air Force, Brig. Gen. Kenneth N. Walker of Glendale, Calif., is shown in this undated photo. Nearly 75 years after his father disappeared during a bombing mission over a remote Pacific island, Douglas Walker, the son of the highest-ranking recipient of the Medal of Honor still listed as missing from World War II, is pushing for renewed interest in finding the crash site and the remains of the crew. (AP Photo/USAF)