How many ways can the D.C. punk icons of yore retell their tales of all-ages basement shows and subverting the ever-hungry maw of the capitalist music industry? After this year, add two more well-sourced volumes to the record: Salad Days: Punk in the Nation’s Capital and Positive Force: More Than a Witness, both documentary films that premiered on the same November weekend. Whether D.C. needs two more rehashings of the white-dude-heavy, MacKaye-Rollins glory days is up for debate (there’ve been plenty of films made on the subject before, including a 1991 doc about Positive Force, profiles of Fugazi and Bad Brains, and a forthcoming doc on the ’70s roots of D.C. hardcore), but the punk scene’s impulse toward nostalgia seems as healthy as it ever was.