Sparoair was developed by the Naval Missile Center, as a two-stage development of the Sparrow III air-to-air missile [REF].
The Sparoair I was the original version of the rocket, launched using an ejection system and a lanyard for firing; after that proved unreliable in flight testing, the Sparoair II was developed that utilised a rail launch with ignition prior to release from the aircraft [REF].