"flying test bed" . . . "test flying" . . "experimentation" . . . "test flight" . . "Test Flight" . "test flights" . "test program" . "experimental tests" . "Flight testing" . "test flight and evaluation" . "flight" . . "In-flight testing" . "test flown" . "initial" . . "flight test" . . . "flight tests" . . "Flight-Test" . . . "propulsive-return over-water tests" . . . "flight-testing" . "flight-tested" . "Test" . "test pilot" . . "Flight test" . "initial flights" . "test aircraft" . . . "acceptance flight" . "TF3
(Test Flight 3)" . "testing site" . "flight testing" . "propulsive return test" . "Vanguard test flight" . "flight-test" . . . "test-flight" . "flight article" . . . . . . "test" . "propulsive-return over-water test" . "TF2
(Test Flight 2)" . "TF1
(Test Flight 1)" . "Test flight" . "flight-test programme" . "testing" . "Test flying" . "Flight test" . "experimental" . .