 Complete the following phrase:  The Rhodesian Air Force acquired 16 Vampire FB.9 fighters and a further 16 Vampire T.11 trainers in the early 1950s, its first jet aircraft, equipping two squadrons. These were regularly deployed to Aden between 1957 and 1961, supporting British counter-insurgency operations. 21 more two-seaters and 13 single-seaters were supplied by South Africa in the late 1960s and early 1970s. Rhodesia operated Vampires until the end of the 