anh ▁H ó a ▁Province ▁on ▁ 2 0 ▁August ▁ 1 9 6 3 ▁to ▁investigate ▁an ▁air ▁res upp ly ▁drop ▁zone ▁that ▁turned ▁out ▁to ▁be ▁a ▁trap ▁for ▁a ▁RO C AF ▁C - 1 2 3 B ▁a ird rop ▁mission ▁ 1 0 ▁days ▁earlier ▁due ▁to ▁the ▁air - insert ed ▁agents ▁having ▁been ▁captured ▁and ▁turned . ▁Next ▁year , ▁an ▁air ▁defense ▁rad ar ▁mapping ▁mission ▁was ▁also ▁flow n ▁by ▁ 3 4 th ▁Squadron ' s ▁R B - 6 9 A / P 2 V - 7 U ▁aircraft ▁into ▁North ▁Vietnam ▁and ▁La os ▁on ▁the ▁night ▁of ▁ 1 6 ▁March ▁ 1 9 6 4 . ▁The ▁R B - 6 9 A ▁took ▁off ▁from ▁Da ▁N ang , ▁fle w ▁up ▁the ▁G ulf ▁of ▁Ton kin ▁before ▁coast ing ▁in ▁near ▁H ai ph ong , ▁then ▁fle w ▁down ▁North ▁Vietnam ▁and ▁the ▁La os ▁border . ▁The ▁mission ▁was ▁requested ▁by ▁SO G ▁for ▁helping ▁plan ▁the ▁insert ▁or ▁res upp ly ▁of ▁agents . ▁Seven ▁A AA ▁sites , ▁ 1 4 ▁early ▁warning ▁rad ar ▁sites ▁and ▁two ▁G CI ▁rad ar ▁signals ▁were ▁detected . ▁ ▁F alk lands ▁War ▁ ▁The ▁Argent ine ▁Naval ▁A viation ▁had ▁received ▁at ▁least ▁ 1 6 ▁Ne pt unes ▁of ▁different ▁variants ▁since ▁ 1 9 5 8 ▁including ▁eight ▁former ▁R AF ▁examples ▁for ▁use ▁in ▁the ▁Esc u adr illa