the Joint Chiefs of Staff. In 1986, the Goldwater–Nichols Act mandated that operational control of the services follows a chain of command from the president to the secretary of defense directly to the unified combatant commanders, who have control of all armed forces units in their geographic or function area of responsibility, thus the secretaries of the military departments (and their respective service chiefs underneath them) only have the responsibility to organize, train and equip their service components. The army provides trained forces to the combatant commanders for use as directed by the secretary of defense. By 2013, the army shifted to six geographical commands that align with the six geographical unified combatant commands (CCMD): United States Army Central headquartered at Shaw Air Force Base, South Carolina United States Army North headquartered at Fort Sam Houston, Texas United States Army South headquartered at Fort Sam Houston, Texas United States Army Europe and Africa headquartered at Clay Kaserne, Wiesbaden, Germany United States Army Pacific headquartered at Fort Shafter, Hawaii The army also transformed its base unit from divisions to brigades. Division lineage will be retained, but the divisional headquarters will be able to command any brigade, not just brigades that carry their divisional lineage. The central part of this plan is that each brigade will be modular, i.e., all brigades of the same type will be exactly the same and thus any brigade can be commanded by any division. As specified before the 2013 end-strength re-definitions, the three major types of brigade combat teams are: Armored brigades, with a strength of 4,743 troops as of 2014. Stryker brigades, with a strength of 4,500 troops as of 2014. Infantry brigades, with a strength of 4,413 troops as of 2014. In addition, there are combat support and service support modular brigades. Combat support brigades include aviation (CAB) brigades, which will come in heavy and light varieties, fires (artillery) brigades (now transforms to division artillery) and expeditionary military intelligence brigades. Combat service support brigades include sustainment brigades and come in several varieties and serve the standard support role in an army. Combat maneuver organizations To track the effects of the 2018 budget cuts, see Transformation of the United States Army#Divisions and brigades The U.S. Army's conventional combat capability currently consists of 11 active divisions and one deployable division headquarters (7th Infantry Division) as well as several independent maneuver units. From 2013 through 2017, the