Sharon Carter

Sharon was an agent of S.H.I.E.L.D. with the code-name Agent 13 and briefly helped form and lead S.H.I.E.L.D.'s so-called Femme Force, an all-women squad of commandos.  Sharon served a brief term as Executive Director of S.H.I.E.L.D. during Nick Fury's absence. She became a field agent once more, reporting directly to the new Executive Director as a liaison officer specifically assigned to support and report on Captain America's activities.