SAS deployed for London, Ariana Grande attacks

No Posse Comitatus. Their military can be used for any and all purposes deemed necessary.

Yes; I have no idea to the extent they can or cannot be used.

Even within Posse Comitatus, JSOC units can be used with regard to "support" of law enforcement, and the AG can request from SECDEF emergency assistance if domestic law enforcement is inadequate to address certain types of threats involving the release of CBRNE materials, as well as a few other, specific cases.
 
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