4 ▁establish ing ▁a ▁formal ▁al liance ▁that ▁last ed ▁until ▁US ▁recognition ▁of ▁the ▁P RC ▁in ▁ 1 9 7 9 . ▁During ▁this ▁period ▁US ▁military ▁advis ers ▁were ▁deployed ▁to ▁the ▁RO C ▁and ▁joint ▁exer cis es ▁were ▁common . ▁The ▁United ▁States ▁Taiwan ▁Def ense ▁Command ▁was ▁established ▁in ▁the ▁Philippines ▁for ▁rein for cement ▁of ▁Taiwan ▁air space . ▁The ▁US ▁and ▁RO C ▁also ▁collabor ated ▁on ▁human ▁and ▁electronic ▁intelligence ▁operations ▁directed ▁against ▁the ▁P RC . ▁RO C ▁units ▁also ▁participated ▁in ▁the ▁Korean ▁War ▁and ▁the ▁Vietnam ▁War ▁in ▁non - com bat ▁capac ities , ▁primarily ▁at ▁the ▁ins istence ▁of ▁the ▁United ▁States ▁which ▁was ▁concerned ▁that ▁the ▁high - profile ▁roles ▁for ▁RO C ▁forces ▁in ▁these ▁conflicts ▁would ▁lead ▁to ▁full ▁scale ▁P RC ▁inter vention . ▁ ▁High - level ▁co operation ▁ended ▁with ▁the ▁US ▁recognition ▁of ▁the ▁P RC ▁in ▁ 1 9 7 9 , ▁when ▁all ▁remaining ▁US ▁forces ▁in ▁Taiwan ▁were ▁with dra wn . ▁The ▁US ▁continued ▁to ▁supply ▁the ▁RO C ▁with ▁arms ▁sales ▁per ▁the ▁Taiwan ▁Rel ations ▁Act , ▁al beit ▁in ▁a ▁dimin ished ▁role . ▁While ▁RO C AF ▁pil ots ▁continued ▁to ▁train ▁at ▁Luke ▁A FB ▁in ▁Arizona , ▁co operation ▁is ▁still ▁limited ▁primarily ▁to ▁civil ian ▁contract ors . ▁ ▁In ▁recent ▁years , ▁the ▁RO C ▁military ▁has ▁again ▁begun ▁higher ▁level ▁co operation ▁with ▁the ▁U . S . ▁Military