Duck and cover: The Atomic Cafe is back. Released in the age of Ronald “Nuclear Cowboy” Reagan and restored in time for yet another outbreak of atomic anxiety, this found-footage documentary is a blast of nuke nostalgia with a long half-life. It begins with images from the 1945 Trinity test and goes on to trace the decades-long fallout of the Bomb on American culture. Collaging together stark archival evidence with jauntily delusional propaganda about how to survive the coming apocalypse, the film is both a deft history of the Cold War and a comic essay on the American knack for turning tragedy and terror into kitsch.