Pringle then arranged for Brown and himself to meet with the Commander in Chief (C-in-C) for Army Co-operation, Sir Arthur Barratt. In a long conversation, the two outlined the possibilities of radar for bombing, navigation and return-to-base roles, all of which proved to be interesting to Barratt. Barratt then stated that any system they did adopt would have to fit in single seat aircraft like the Tomahawk, which eliminated most of these possibilities. Both Pringle and Brown then focused on the use of a transponder system combined with existing radars to allow accurate bombing or delivery of supplies or troops by parachute, a role that would almost always be carried out by twin-engine aircraft or larger. If this broadcast on the 200 MHz frequency then being used by many British radars, any aircraft with AI or Air-to-Surface Vessel radar could pick it up.