 Complete the following phrase:  The Edgley Optica was a British fixed-wing aircraft built for observation use and was used by the Hampshire Constabulary as an alternative to rotary-wing aircraft. The Britten-Norman Defender is used by the Greater Manchester Police, the Police Service of Northern Ireland and the Garda Síochána. The FBI deployed one Britten-Norman Defender for electronic aerial surveillance at the Branch Davidian compound during the 