The 187th Infantry Brigade was reactivated as an initial entry training unit at the U.S. Army Maneuver Support Center of Excellence, Fort Leonard Wood, Missouri on 23 January 2007 from the 3rd Training Brigade and inactivated on 17 May 2007.
The subordinate units were reassigned to the 3rd Chemical Brigade.

Its subordinate battalions were as follows:
 2nd Battalion, 10th Infantry Regiment
 3rd Battalion, 10th Infantry Regiment
 1st Battalion, 48th Infantry Regiment
 43rd Adjutant General Battalion
The 187th Infantry Brigade was reactivated as an initial entry training unit at the U.S. Army Maneuver Support Center of Excellence, Fort Leonard Wood, Missouri on 23 January 2007 from the 3rd Training Brigade and inactivated on 17 May 2007. The subordinate units were reassigned to the 3rd Chemical Brigade.
Its subordinate battalions were as follows:
 2nd Battalion, 10th Infantry Regiment
 3rd Battalion, 10th Infantry Regiment
 1st Battalion, 48th Infantry Regiment
 43rd Adjutant General Battalion
187th Infantry Brigade (United States)