 Milligan's investigation, completed in July, concluded that the explosion was caused intentionally by a Turret Two crewman named Clayton Hartwig who Milligan believed was suicidal and homicidal. Milligan also found that, under Moosally, Iowa was operating with severe training and safety deficiencies. The finding that the explosion was intentionally caused by Hartwig was heavily criticized by the victims' families, the media, and members of Congress. Most of Iowa's crewmen also did not believe that Hartwig was responsible for the explosion.
