The armored brigade combat team (ABCT) is the army's primary armored force. It is designed around combined arms battalions (CABs) that contain both M1 Abrams tanks and M2 Bradley infantry fighting vehicles (IFVs). Other vehicles, such as HMMWVs and M113 armored personnel carrier, operate in a supporting role. In the future, it will also contain vehicles from the Armored Multi-Purpose Vehicle and likely the Optionally Manned Fighting Vehicle (OMFV). An armored brigade combat team consists of seven battalions: three combined arms battalions, one cavalry (reconnaissance) squadron, one artillery battalion, one engineer battalion and one brigade support battalion. As of 2014, the armored brigade combat team is the largest brigade combat team formation with 4,743 soldiers. Prior to 2012, the armored brigade combat team was named the heavy brigade combat team. An ABCT includes 87 Abrams, 152 Bradley IFVs, 18 M109s and 45 armed M113 vehicles. The operational cost for these combat systems is $66,735 per mile. The range of the Abrams limits the brigade to 330 km (205 miles), requiring fuel every 12 hours. The brigade can self-transport 738,100 L (195,000 gallons) of fuel, which is transported by 15 19,000 L (5,000 gal) M969A1 tankers and 48 9,500 L (2,500 gal) M978 tankers. Prior to 2016, the CAB contained two tank companies and two mechanized infantry companies. In 2016, the CAB was reorganized to have two variations; an "armored battalion" biased towards armor, with two tank companies and one mechanized infantry company, and a "mechanized infantry" battalion biased towards infantry, with two mechanized infantry companies and one tank company. The ABCTs thus adopted a "triangle" structure of two armored battalions and one mechanized infantry battalion. This resulted in an overall reduction of two mechanized infantry companies; the deleted armored company was reflagged to the cavalry squadron. Pre-2016 organizational restructure for combined armor/infantry assets Combined Arms Battalion (×3) Headquarters and Headquarters Company (HHC) Tank Company (×2) Mechanized Infantry Company (×2) Post-2016 organizational restructure for combined armor/infantry assets Armored Battalion (×2) Headquarters and Headquarters Company Tank Company (×2) Mechanized Infantry Company Mechanized Infantry Battalion (×1) Headquarters and Headquarters Company Tank Company Mechanized Infantry Company (×2) Cavalry Squadron Headquarters and headquarters troop Cavalry Troop (×3) Tank Company (×1) Field Artillery Battalion Headquarters and Headquarters Battery Target Acquisition Platoon M109 155mm Self-propelled Howitzer Battery (×3) Brigade Engineer Battalion Headquarters and Headquarters Company Military Intelligence Company Signal Network Support Company Combat Engineer Company (×2) Brigade