▁troops . ▁ ▁The ▁Air ▁Force ▁Development ▁Test ▁Center , ▁Eg lin ▁Air ▁Force ▁Base , ▁Florida , ▁began ▁developing ▁the ▁G BU - 1 5 ▁in ▁ 1 9 7 4 . ▁The ▁Air ▁Force ▁originally ▁asked ▁for ▁the ▁miss ile ▁design ations ▁AG M - 1 1 2 A ▁and ▁AG M - 1 1 2 B ▁for ▁two ▁versions ▁of ▁the ▁system . ▁This ▁was ▁decl ined ▁because ▁the ▁weapon ▁was ▁an ▁un power ed ▁gli de ▁bomb ▁and ▁G BU ▁design ation ▁was ▁all otted ▁instead . ▁The ▁M - 1 1 2 ▁design ation ▁remains ▁un ass igned ▁as ▁a ▁result . ▁ ▁It ▁was ▁a ▁product ▁improvement ▁of ▁the ▁early ▁gu ided ▁bomb ▁used ▁during ▁the ▁Vietnam ▁War ▁called ▁the ▁G BU - 8 ▁H OB OS . ▁The ▁G BU - 8 ▁could ▁not ▁be ▁controlled ▁after ▁the ▁bomb ▁was ▁released . ▁Instead , ▁the ▁aircraft ▁was ▁forced ▁to ▁fly ▁very ▁close ▁to ▁the ▁target ▁so ▁the ▁W SO ▁could ▁ac quire ▁it . ▁Once ▁locked ▁on , ▁the ▁weapon ▁could ▁be ▁released ▁and ▁the ▁aircraft ▁could ▁return ▁to ▁base . ▁ ▁Fl ight ▁testing ▁of ▁the ▁weapon ▁began ▁in ▁ 1 9 7 5 . ▁The ▁G BU - 1 5 ▁with ▁television ▁guidance , ▁completed ▁full - scale ▁oper ational ▁test ▁and ▁evaluation ▁in ▁November ▁ 1 9 8 3 . ▁In ▁February ▁ 1 9 8 5 , ▁initial ▁oper ational ▁test ▁and ▁evaluation ▁was ▁completed ▁on ▁the ▁imag ing ▁inf ra red