After violently suppressing anti-government marches last year, Burma’s ruling generals are hunt­ing a new enemy in the dilapidated city of Rangoon, zeroing in on street vendors who sell pirated DVDs. The object of the junta’s wrath is the latest Rambo film, in which the Vietnam veteran played by Sylvester Stallone battles Burmese soldiers to rescue missionaries held for assisting persecuted ethnic minorities.