That dialogue exchange takes place between Father Geoghegen (Frank Finlay) and Col. Allen Faulkner (the late great Sir Richard Burton) in the 1978 film “The Wild Geese,” which I consider one of the most underrated and badass action-adventure films ever made. The film was shot largely in South Africa, and much of the military equipment appearing in the film was indeed furnished by the South African Armed Forces, including the aforementioned Dakota, which appears at the 3:47 mark of this embedded movie clip:
