By the 1980s, a Soviet investment of $5 billion in military hardware helped lead the MPLA to victory in the war.  Weapons provided included "T-34 and T-54 tanks, 100mm guns, 120mm multiple rocket launchers, amphibious vehicles, helicopters equipped with 20mm cannon and air-to-ground rockets" as well as MIG-17 and MIG-21 fighter jets.  Soviet and Cuban presence continued until the late 80s when global political changes and the end of the Cold War took away many of the incentives of remaining in Angola.