▁Mc F at ridge , ▁ 2 7 ▁September ▁ 2 0 1 0 ▁ ▁L t ▁Col ▁Karl ▁F isch bach , ▁May ▁ 2 0 1 1 ▁ ▁L t ▁Col ▁Don ▁Ke en , ▁May ▁ 2 0 1 3 ▁ ▁L t ▁Col ▁Allen ▁A . ▁Ge ist , ▁ 2 0 ▁May ▁ 2 0 1 5 ▁ ▁L t ▁Col ▁J ef fer y ▁S . ▁K asse baum , ▁May ▁ 2 0 1 7 ▁ ▁References ▁ ▁Notes ▁ ▁Bibli ography ▁ ▁External ▁links ▁ 3 6 6 th ▁Oper ations ▁Group ▁Fact ▁She et ▁Naval ▁Air ▁Station ▁Wh id bey ▁Island ▁Web ▁Page ▁– ▁ 3 9 0 th ▁Electron ic ▁Com bat ▁Squadron ▁ ▁Category : Mil it ary ▁units ▁and ▁form ations ▁established ▁in ▁ 1 9 4 3 ▁Category : Mil it ary ▁units ▁and ▁form ations ▁in ▁Id aho ▁Category : E lect ron ic ▁combat ▁squad rons ▁of ▁the ▁United ▁States ▁Air ▁Force <0x0A> </s> ▁The ▁F irth ▁Hel ic opter ▁was ▁a ▁British ▁hel ic opter ▁of ▁the ▁early ▁ 1 9 5 0 s . ▁Design ed ▁to ▁explo it ▁new ▁out r igger ▁rot or ▁technology , ▁the ▁hel ic opter ▁was ▁abandoned ▁during ▁construction . ▁ ▁Design ▁and ▁development ▁Based ▁on ▁the ▁designs ▁of ▁American ▁engineer ▁Fred ▁Land g raf ▁who ▁established ▁the ▁Land g raf ▁Hel ic opter ▁Corporation ▁in ▁the ▁early ▁years ▁of ▁the ▁Second ▁World ▁War , ▁The ▁F irth ▁Hel ic