It is neither the government seeking change, nor a "CYA" thing. It is the filling of the legal requirement to seek competitive bids before entering into a large contract. It happens all the time when long term contracts are set to expire and there are no remaining options to extend. Logisticunicorps may win this again or someone else may win (and it is not uncommon that the "in-place contractor" grows complacent and fails to offer the most competitive proposal).