Looking for ways around the deadlock, Henry Tizard sent Archibald Vivian Hill to the U.S. to take a survey of U.S. technical capability in order to better assess what technologies the U.S. would be willing to exchange. This effort was the start on the path that led to the famous Tizard Mission in late August 1940. Ironically, by the time the Mission was being planned, the Norden had been removed from the list of items to be discussed, and Roosevelt personally noted this was due largely to political reasons. Ultimately, although Tizard was unable to convince the U.S. to release the design, he was able to request information about its external dimensions and details on the mounting system so it could be easily added to British bombers if it were released in the future.