Let's examine why the Air Force wants the B-52J to operate alongside the B-21 Raider. The B-21 Raider will be a generational leap over the B-2 Spirit. Carrying munitions internally dramatically increases stealth as well as range, but it also limits how many munitions an aircraft can carry. The B-21 Raider has an unclassified payload capacity of around 30,000 lbs (13,600 kg), or less than half of the B-52's payload capacity of 70,000 lbs (31,751 kg). It is much easier to perform test flights of new air-launched weapons on a spacious and robust bomber like the B-52.