The United States Holocaust Memorial Museum has acquired a prized copy of *Captain America Comics* No. 1, famous for its cover depicting the titular hero punching Adolf Hitler in the face, the museum announced Tuesday. The issue was published in December 1940, nearly a year before the United States entered World War II, and entered the museum’s holdings courtesy of Riot Games cofounder Brandon Beck. Jack Kirby—who, with Joe Simon, created a host of iconic Marvel superheroes—was the son of Austrian Jewish immigrants and later served in the US Army during the war. According to the museum, Kirby conceived the now-famous *Captain America* cover as a not-so-veiled rebuke of the nation’s isolationist stance amid the mounting Nazi threat. The effort proved influential: the widely circulated comic has been credited with helping raise public awareness in the United States of the escalating conflict in Europe.…