 The chiefs of staff of the army and navy were both strongly opposed to the Arrow, since "substantial funds were being diverted to the air force", while Air Marshal Hugh Campbell, RCAF Chief of Staff, backed it right up until its cancellation.In June 1957, when the governing Liberals lost the federal election and a Progressive Conservative government under John Diefenbaker took power, the aircraft's prospects began to noticeably change.Diefenbaker had campaigned on a platform of reining in what the Conservatives claimed was "rampant Liberal spending".