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@sickburnbro @epictittus High-flying ballistic missiles are another story, but you really shouldn't be using those as weapons anymore anyway. They're much easier to detect, track, and defend against than something skimming the surface.

Guiding hypersonic glide vehicles is probably a huge pain in the ass. GPS is likely too slow and onboard cameras would be a big blur. My guess is they're some combination of high precision inertial guidance and target illumination where possible. Online sources are rather vague about the details.