Desert Storm-Engineer (ODS-E), 1× M113A3 Armored Personnel Carrier (APC), 3× M1150 Assault Breacher Vehicle (ABV), 1× M9 Armored Combat Earthmover (ACE), and 2× M104 Heavy Assault Bridge (HAB). a Cavalry (formerly Armed Reconnaissance) Squadron, consisting of a headquarters troop (HHT) and three reconnaissance troops and one armored troop. The HHT fields 2× M3A3 Cavalry Fighting Vehicles (CFVs) and 3× M7A3 Bradley Fire Support Vehicles, while each reconnaissance troop fields 7× M3A3 CFVs. The squadron fields 35 officers and 385 enlisted personnel – total: 424 soldiers. three identical combined arms battalions, flagged as a battalion of an infantry, armored or cavalry regiment. Each battalion consists of a headquarters and headquarters company, two tank companies and two mechanized infantry companies. The battalions field 48 officers and 580 enlisted personnel each – total: 628 soldiers. The HHC fields 1× M1A2 main battle tank, 1× M2A3 infantry fighting vehicle, 3× M3A3 cavalry fighting vehicles, 4× M7A3 fire support vehicles and 4× M1064 mortar carriers with M120 120 mm mortars. Each of the two tank companies fields 14× M1A2 main battle tanks, while each mechanized infantry company fields 14× M2A3 infantry fighting vehicles. In 2016, the ABCT's combined arms battalions adopted a triangle structure, of two armored battalions (of two armored companies plus a single mechanized infantry company) plus a mechanized infantry battalion (of two mechanized companies and one armored company). This resulted in the reduction of two mechanized infantry companies; the deleted armored company was reflagged as a troop to the Cavalry Squadron. a Field Artillery battalion, consisting of a headquarters battery, two cannon batteries with 8× M109A6 self-propelled 155 mm howitzers each (the changes announced by the U.S. Army on 25 June 2013, include adding a third battery to the FA battalion, and reducing the size of each battery from 8 to 6 guns; these changes also increase the number of troops in the affected battalions and also increase the total troops in the Brigade), and a target acquisition platoon. 24 officers, 2 warrant officers, 296 enlisted personnel – total: 322 soldiers. a brigade support battalion (BSB), consisting of a headquarters, medical, distribution and maintenance company, plus six forward support companies, each of which support one of the three combined arms battalions, the cavalry squadron, the engineer battalion and the field artillery battalion. 61 officers, 14 warrant officers, 1,019 enlisted personnel – total: 1,094 soldiers. Infantry Brigade Combat Team, or IBCTs, comprised around