Sarajevo is the capital city in Bosnia and Herzegovina, and the most populous city in the country.
In 1990, S.H.I.E.L.D. Agent John Garrett was sent on a mission to Sarajevo, Yugoslavia, where he was wounded by an improvised explosive device that left him with critical injuries. Garrett requested medical assistance but, despite his loyalty to the agency, his medical evacuation was denied with a series of excuses.
At that very moment, Garrett decided he would treat the agency the same way it treated him. He managed to survive placing his intestines back inside his body and closing the wound with duct tape, having to be implanted with bio-mechanical parts by Cybertek in order to survive.
Due to Garrett's traumatic experience, he joined HYDRA as one of its covert operatives while the organization rebuilt itself inside S.H.I.E.L.D. In 1992, Sarajevo became part of the newly formed Bosnia and Herzegovina, following the dissolution of Yugoslavia.