This story is an updated version of the second story "Captain America Comics" #1 (March 1941).
Agent 13 here is neither the modern-day SHIELD Agent 13 (Sharon Carter), nor her relative Peggy Carter, the latter of whom is a teenaged fighter in the World War II French resistance when Captain America meets her for the first time in "Tales of Suspense" #77 (May 1966). In the original 1941 version of the story, the woman identifies herself as "Betty Ross," a character who later calls herself "Betsy Ross" and eventually becomes Golden Girl.
Letters from Cathi Manfredi, David Banks, Donald Taylor, John Burchfield and a special announcements section.
Marvel Checklist - comics listed with a synopsis are Fantastic Four #37, Spider-Man #23, Avengers #14, X-Men #10, Thor (Journey Into Mystery) #114, Strange Tales #131, Astonish #66 and Sgt. Fury #16.