My grandson was born at the U.S. Air Force hospital at Lakenheath, but transferred after two days to Norwich civilian hospital because of 'complications' (both my daughter and son-in-law were serving in the U.S.A.F. at Lakenheath) and has a U.S. Birth Certificate and Passport. However, when he is 18 (he's currently 8), he can choose whether he wants U.S. or British citizenship, apparently.