It’s been around for a long time. Throughout the various Marvel universes, S.H.I.E.L.D. as an organization typically dates back to the postwar era. In its original incarnation, it was a Cold War organization whose main nemesis was HYDRA (which, confusingly, was not an acronym even though it’s usually rendered in all-caps.) In the Marvel movies, Tony Stark’s father Howard Stark was a founding member.
Strategic Homeland Intervention, Enforcement and Logistics Division.
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