assumably Scramjet and Unmanned , prior to SR71 they did a single
engine 3000 mph reconasaince drone.
It shows lineage with tacit blue I think
in the engine/body/tail config , Lifting body also, I think.
the suggestion of heat signature being problematic is interesting.
Diamond edges on a diamond shape might do. plus a cold air bypass
injection into the exhaust.
I think it may be detectable by a type of geo stationary sattelite and ground
station network of composite sensrs. in a Bi Static array.
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