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What aircraft launched the missile? Did the missile also have a rocket engine to get up to scramjet ignition speed ? How long did the scramjet fire ? Was it able to increase speed ? - Rod57 ( talk) 12:42, 4 October 2021 (UTC) reply

I think this page could use a section on why HAWC exists, given that its range and speed seem similar to short-range ballistic missiles. I believe the answer is that flying at low altitude makes it harder to shoot down. I wasn't able to find any information that says it carries a larger warhead. Intuitively an air-breathing engine might be more efficient than a rocket because it harvests propellant from the atmosphere, but it also experiences much higher drag. The DARPA press releases give hardly any information, so better citations would be valuable. 104.246.222.63 ( talk) 21:47, 8 April 2022 (UTC) reply