In September 1940, a group of British physicists and engineers visited their counterparts in the US in what became known as the Tizard Mission. The goal of the meetings was to exchange technical information that might be of use to the war effort. The British were hesitant to give away too much information without getting anything in return, and initial progress was slow. When they moved onto the topic of radar, the British team was surprised to learn that the US was in the process of developing two systems similar to their own existing Chain Home, the Navy's CXAM and the Army's SCR-270. This began to break the ice between the two groups.