<prompt> Translate the following text to EnglishGharama za kitengo kwa ajili ya mpango F-18 E-F hazikua tangu ukaguzi muhimu wa kubuni na ratiba yake imecheleweshwa kwa miezi mitatu tu.  <response>: Unit costs for the FA-18 EF program have not grown since the critical design review and its schedule has been delayed by only 3 months. 