Skyflash
The Skyflash , or Sky Flash in marketing material , was a medium-range semi-active radar homing air-to-air missile derived from the US AIM-7 Sparrow missile and carried by Royal Air Force F-4 Phantoms and Tornado F3s , Italian Aeronautica Militare and Royal Saudi Air Force Tornados and Swedish Flygvapnet Viggens . 
<triplet> Skyflash <subj> semi-active radar homing <obj> guidance system <subj> air-to-air missile <obj> subclass of <subj> Royal Air Force <obj> operator <triplet> AIM-7 Sparrow <subj> semi-active radar homing <obj> guidance system <subj> air-to-air missile <obj> subclass of