Two test systems emerged from this centralization. The CTV.1 was a small unpowered Brakemine-like system devoted to the development of the guidance systems, launched using three RP-3 rocket motors and controlled through the coast phase. A series of CTV designs followed, providing ever-increasing amounts of telemetry for the guidance and control systems work. GAP became a purely research-oriented system, RTV.1 (rocket test vehicle), as opposed to a prototype missile design, and was used primarily as a platform for testing the rocket motors. The GAP/RTV.1 efforts would be directed at the Stage 1 design, which would essentially be the Seaslug requirement.