Harold Webster Gehman Jr. is a retired United States Navy four-star admiral who served as NATO's Supreme Allied Commander, Atlantic, Commander-in-Chief of the United States Joint Forces Command, one of the United States' Unified Combatant Commands, and Vice Chief of Naval Operations. He was also the Co-Chairman of the Commission that investigated the terrorist attack on the USS Cole and was Chairman of the Columbia Accident Investigation Board after the Space Shuttle Columbia disintegrated during reentry in 2003, killing all seven crew members.