The Pakistan Air Force (PAF) is believed to have practised "toss-bombing" in the 1980s and 1990s, a method of launching weapons from fighter-bombers which can also be used to deliver nuclear warheads. The PAF has two dedicated units (No. 16 "Black Panthers" and No. 26 "Black Spiders") operating 18 aircraft in each squadron (36 aircraft total) of the JF-17 Thunder, believed to be the preferred vehicle for delivery of nuclear weapons. These units are major part of the Air Force Strategic Command, a command responsible for nuclear response. The PAF also operates a fleet of F-16 fighters, of which 18 were delivered in 2012 and confirmed by General Ashfaq Parvez Kayani, are capable of carrying nuclear weapons. With a third squadron being raised, this would bring the total number of dedicated nuclear capable aircraft to a total of 54. The PAF also possesses the Ra'ad air-launched cruise missile which has a range of 350 km and can carry a nuclear warhead with a yield of between 10kt to 35kt.