One important lesson learned from the jungles of Vietnam was the ever-present danger to attack aircraft from ground fire. Lowing flying AH-1A Huey Cobra's, A-7 Corsair II's, and A-1 Skyraiders, for example, were constantly sent into battle at low altitudes amid raking fire to attack ground targets. However, despite an attack aircrafts vulnerability to ground fire, their accuracy and devastating weaponry easily neutralized ground opposition. The A-10, affectionately nicknamed the "Warthog", was built from the ground up with lessons learned in the Vietnam War. The A-10 has gained a reputation for being able to send its pilots through hell and still see them safely back to base. Since its introduction in 1976, it has been a bane on armour and stationary defences alike.