▁AC - 4 7 ▁Spo ok y ▁gun ships ▁began ▁operating ▁from ▁the ▁base . ▁▁ ▁On ▁ 2 1 ▁September ▁ 1 9 6 7 ▁the ▁first ▁Lock he ed ▁AC - 1 3 0 A ▁Project ▁Gun ship ▁II ▁prototype ▁arrived ▁at ▁N ha ▁Tr ang ▁for ▁combat ▁evaluation , ▁the ▁evaluation ▁program ▁concluded ▁on ▁ 8 ▁December ▁ 1 9 6 7 . ▁▁ ▁On ▁ 2 5 ▁October ▁ 1 9 6 7 ▁the ▁ 1 4 th ▁Air ▁Comm ando ▁Squadron ▁was ▁activ ated ▁at ▁N ha ▁Tr ang , ▁with ▁ 3 ▁AC - 4 7 s ▁of ▁A ▁Fl ight - based ▁there . ▁ ▁In ▁late ▁December ▁ 1 9 6 8 ▁the ▁ 7 1 st ▁Special ▁Oper ations ▁Squadron ▁equ ipped ▁with ▁AC - 1 1 9 G ▁Sh adow ▁gun ships ▁arrived ▁from ▁Lock bourne ▁Air ▁Force ▁Base ▁and ▁began ▁operations ▁from ▁the ▁base . ▁On ▁ 1 ▁June ▁ 1 9 6 9 ▁the ▁ 1 7 th ▁Special ▁Oper ations ▁Squadron ▁equ ipped ▁with ▁AC - 1 1 9 G ▁gun ships ▁was ▁activ ated ▁at ▁N ha ▁Tr ang ▁and ▁it ▁replaced ▁the ▁ 7 1 st ▁Special ▁Oper ations ▁Squadron ▁which ▁returned ▁to ▁Bak al ar ▁Air ▁Force ▁Base ▁for ▁in activ ation . ▁ ▁In ▁mid - 1 9 6 9 , ▁as ▁part ▁of ▁the ▁process ▁of ▁Vietnam ization , ▁US AF ▁units ▁at ▁N ha ▁Tr ang ▁began ▁to ▁re loc ate ▁or ▁in activ