The VDV divisions are equipped with armoured fighting vehicles, artillery and anti-aircraft guns, trucks and jeeps. Thus VDV units possess superior mobility and firepower with these vehicles. Each division has both regiments equipped with them and their derivatives. (Each division used to have three regiments, but the 106th was the last, and lost its third regiment in 2006.) With the reduction in forces after 1991, the 61st Air Army, Russia's military air transport force, has enough operational heavy transport aircraft to move one airborne division, manned at peacetime standards, in two-and-a-half lifts. The single independent brigade, the 31st at Ulyanovsk, however, is not equipped with its own armor or artillery and may be equivalent to Western airborne troops, in that it functions as light infantry and must walk when reaching their destination. The 31st was the former 104th Guards Airborne Division.