 In 1989, Secretary of Defense Dick Cheney refused to approve the purchase of any more F-14D model aircraft for $50 million each and pushed for a $25 million modernization of the F-14 fleet instead.Congress decided not to shut production down and funded 55 aircraft as part of a compromise.A total of 37 new aircraft were completed, and 18 F-14A models were upgraded to D-models, designated F-14D(R) for a rebuild.