The Army's 1st Cavalry Division and elements of the 4th Infantry Division, as well as the 3rd Armored Cavalry Regiment and the 13th Corps Support Command, are based at Fort Hood.

CNN: Fort Hood, a home for thousands

Fort Hood, with about 40, 000 troops, is home to the Army's 1st Cavalry Division and elements of the 4th Infantry Division, as well as the 3rd Armored Cavalry Regiment and the 13th Corps Support Command.

CNN: Officials: Fort Hood shootings suspect alive; 12 dead