 Bull had largely finished his PhD thesis on the same topic in 1950, when a request from the DRB asking that the Institute provide an aerodynamicist to help on their Velvet Glove Missile project arrived.It was to be an unpaid position on which the volunteer would remain on a normal PhD stipend from the University.Patterson selected Bull for the position, which led to a period of successful work at the Canadian Armament and Research Development Establishment, or CARDE.