David Zeiger’s impassioned 2005 documentary never mentions the words Iraq or Afghanistan. It doesn’t have to. Unseen and unremarked upon, those bloody venues nonetheless inhabit the entire 83 minutes of the film. Its broader subject is the GI antiwar movement of the late ’60s and early ’70s, a phenomenon far more powerful than Swift boaters and neocon revisionists would have us believe. Sir! No Sir! recalls the follies and failures of one American war, but disturbing parallels to the current one are inescapable. (NR) BILL GALLO

Fri., April 18, 7 p.m., 2008