Fort Knox spokesman Ryan Brus said Friday morning that the accident happened Wednesday night and involved members of a Naval branch at the post in central Kentucky.
Brus had no other details and referred calls to U.S. Navy Lt. David Lloyd. Lloyd did not immediately return a call to The Associated Press.
Fort Knox is about 50 miles southwest of Louisville and is home to about 14,000 military personnel, including active duty members and reserves.
The U.S. Navy has used Fort Knox as a training ground since World War II. Naval architects tested mock-ups of ships at the inland post before the actual vessels were used in combat.
Copyright 2013 The Associated Press.