 Complete the following phrase:  The Egyptian Air Force received its first of a planned 66 Vampire FB52s in December 1950, eventually receiving 50 from de Havilland production. An order for 12 Vampire NF.10 night fighters was cancelled owing to an arms embargo and the aircraft were acquired by the RAF. A factory was built at Helwan to build the Vampire under licence, but political disputes between Egypt and the United Kingdom over the presence of British troops in Egypt led to the project being delayed, before being abandoned following the 