9 . ▁ ▁A ▁Fl ight ▁was ▁re located ▁to ▁Ph ù ▁C át ▁Air ▁Base ▁on ▁ 1 2 ▁April , ▁taking ▁over ▁the ▁ 1 8 ▁S OS ▁facilities ▁there . ▁On ▁ 2 8 ▁April , ▁an ▁AC - 1 1 9 G ▁from ▁the ▁ 1 7 ▁S OS , ▁Sh adow ▁ 7 8 , ▁crash ed ▁on ▁take off ▁from ▁Tan ▁Son ▁N h ut ▁after ▁an ▁engine ▁failure , ▁killing ▁six ▁of ▁the ▁eight ▁crew members . ▁From ▁ 5 ▁May ▁ 1 9 7 0 , ▁the ▁squad ron ▁began ▁flying ▁in ▁the ▁Camb od ian ▁Camp aign ▁after ▁United ▁States ▁forces ▁moved ▁into ▁Camb odia ▁to ▁prop ▁up ▁the ▁Camb od ian ▁Army ▁and ▁capture ▁North ▁Vietnam ese ▁base ▁cam ps , ▁and ▁its ▁air ▁support ▁was ▁cred ited ▁with ▁lif ting ▁the ▁sie ge ▁of ▁K amp ong ▁Thom . ▁The ▁ 1 7 th ' s ▁cre ws ▁fle w ▁ 3 2 ▁miss ions ▁in ▁three ▁days ▁at ▁K amp ong ▁Thom ▁and ▁expanded ▁over ▁ 5 0 0 , 0 0 0 ▁ 7 . 6 2 mm ▁r ounds ▁during ▁the ▁campaign . ▁Although ▁the ▁ground ▁campaign ▁ended ▁on ▁ 3 0 ▁June , ▁the ▁gun ships ▁continued ▁to ▁provide ▁air ▁support ▁to ▁the ▁Camb od ian ▁Army ▁and ▁on ▁ 1 ▁August ▁the ▁gun ships ▁began ▁day time ▁air ▁inter diction ▁due ▁to ▁the ▁lack ▁of ▁effective ▁enemy ▁ant ia ircraft ▁fire ▁in ▁the ▁country . ▁ ▁Between