There were two air stations operating in Bermuda at the start of the Second World War, the civil airport on Darrell's Island, which was taken over by the Royal Air Force for the duration, and the Royal Naval Air Station on Boaz Island. Both were limited to operating flying boats, as Bermuda's limited and hilly landmass offered no obvious site for an airfield. The US Army succeeded in building the airfield by levelling small islands and infilling the waterways between (at the West End, the U.S. Navy used the same methods to create its Naval Air Station, which—like the British bases—was restricted to use by seaplanes).