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The company has not yet made a decision on the engine for the first stage, where Blue Origin’s BE-4 still appears favored over Aerojet Rocketdyne’s AR-1 engine. This decision on the upper stage could partly be a political move, giving Aerojet the upper stage in order to make it easier to give the lower stage to Blue Origin.
ULA is forced to play politics here because politicians are involved. A number of power members of Congress want Aerojet Rocketdyne to get the business, and ULA risks offending these legislators should it abandon that company entirely.