What is "s.t.r.i.k.e."

S.T.R.I.K.E., an acronym for Special Tactical Reserve for International Key Emergencies, is a fictional comic book counter-terrorism and intelligence agency in the . The organization often deals with superhuman threats, and was introduced in Captain Britain Weekly #17 as the United Kingdom's counterpart to the United States' anti-terrorism agency S.H.I.E.L.D.