On June 5, 1999, Fort Riley once again became a Division Headquarters with the reactivation of the 24th Infantry Division (Mechanized). The 24th Infantry Division (Mech.) is the Headquarters for three enhanced Separate Brigades (eSBs) of the Army National Guard. Under the integrated Active Component/Reserve Component concept, the 24th Infantry Division (Mech.) consists of an active component headquarters at Fort Riley and three enhanced Separate Brigades: 30th Heavy Separate Brigade at Clinton, North Carolina, 218th Heavy Separate Brigade at Columbia, South Carolina, and the 48th Separate Infantry Brigade in Macon, Georgia. These units were on eight-year training cycles that culminate in a National Training Center rotation. They also back-fill active duty units for Major Theater War contingencies and provide units for Stabilization Force rotations in Bosnia.