Rear Adm. Richard D. Milligan holds up a book during a Pentagon press conference called to release the findings of the Navy's official investigation into the April 19, 1989, explosion in Turret No. 2 aboard the battleship USS IOWA (BB-61). The book was found in the personal effects of GUNNER's Mate G (Guns) 2nd Class Clayton M. Hartwig, one of the sailors killed in the explosion. Navy investigators concluded that Hartwig intentionally caused the blast