The AIM-7 Sparrow is an American, medium-range, semi-active homing, air-to-air operated by the United States Military (excluding the Army), as well as many other allied air forces and navies. The AIM-7 Sparrow was an iniative towards beyond visual range missiles (BVR), allowing greater performance in combat, firing using radar guidance, which surpassed infrared tracking range. The Sparrow was the United States' primary BVR missile, from the 1950s to the 1990s. The Sparrow is still in active use, though it is being replaced with the newer and more advanced AIM-120 AMRAAM.