1. 
   SA-6 Gainful
   (from the article `rocket and missile system`) ...in the projectile that was sensitive to the reflected energy then homed onto the target. Like active guidance, semiactive guidance was commonly ... The SA-5 Gammon was a high- and medium-altitude strategic missile system with a range of 185 miles; it...
   Found op http://www.britannica.com/eb/a-z/s/1
   
   

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