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To my knowledge and from working on the B-2 program, the aircraft does not fly missions at low altitude to my knowledge, I left the program in 1997. We flight tested low altitude, terrain following but the aircraft is too slow for the low altitude mission. Tornado, F-111, B-1, all fast-movers but the B-2, not so much. However, the B-2 is quiet at low altitude when at stable speed and at a stable throttle condition. The high to medium altitude mission for the B-21 is just fine.