Owen Gleiberman Chief Film CriticIn “Red, White and Blue,” the fifth and final film of Steve McQueen’s Small Axe anthology (and the third to be shown at this year’s New York Film Festival, after the lilting reggae house-party movie “Lovers Rock” and the wrenching social-protest courtroom drama “Mangrove”), Leroy Logan (John Boyega), a British research scientist, figures that he’s had enough of the lonely work of staring at tissue specimens through a microscope, so he decides to become a member