David Zeiger's documentary feature Sir! No Sir! might be described as a therapeutic film, since it seeks to cure some small part of America's amnesia. The experience that's been forgotten--repressed, rather--is that of the Vietnam soldiers' antiwar movement, which spread and intensified throughout the 1960s. Zeiger's method for restoring the memory of this movement, appropriately enough, is to assemble an astonishing collage of archival material, then bring it up to date by interviewing many of the protesters and resisters you see in the old footage. I don't have space to give the entire honor roll, but you should know that it encompasses female and male, enlisted troops and officers, black, white and Puerto Rican, in every branch of the military. Perhaps Zeiger incorporates one too many snippets of Jane Fonda; and maybe, in his enthusiasm for the GI movement, he ultimately overstates its impact, when he gives the impression that a full-scale mutiny was brewing by the early 1970s. (I recall encountering plenty of veterans who hated what they'd been through but also hated the Vietnamese and the antiwar movement.) But enough quibbles. This would have been an important film just by virtue of existing. The way Zeiger has made Sir! No Sir!, it's outstanding. Sir! No Sir! has just begun a theatrical run at New York's IFC Center and will open in Los Angeles on May 5 at Laemmle's Monica 4.