 The plan was modified several times including an expansion of troop numbers in 2007 and changes to the number of modular brigades.On 25 June 2013, plans were announced to disband 13 modular brigade combat teams (BCTs) and expand the remaining brigades with an extra maneuver battalion, extra fires batteries, and an engineer battalion.The Secretary of the Army approved implementing ARFORGEN, a transformational force generation model, in 2006.