(supposed shell game of cost, mentioned by whoever)
What you're referring to is GFE (government funded equipment) if for example a certain engine is already in the government supply system and is directed to be used. As an example, one version of the UH-1 that the AF bought was directed to use the same engine as the HH-3, since there were already plenty of engines bought but the HH-3 was being phased out in favor of the HH-53.
Last edited by busdriver02; 26th Mar 2013 at 00:19.