AIM-9 Sidewinder
The AIM-9 Sidewinder is a short-range air-to-air missile, which means it is shot from an aircraft to hit another aircraft. It is heat seeking, which means it locks on to something that is hot. It first flew in 1953, and went into air forces in 1956. It was used during the Vietnam War along with the AIM-7 Sparrow. The AIM-9 of that time was made for shooting at an enemy from behind and homing in on the engine. In Vietnam it hit only 10-20% of the time, and could be fooled. Sometimes it could lock on to the sun or other bogus heat source and not an enemy airplane.