Two stars. Rated R. 114 minutes. Efraim Diveroli, the ungainly, socially awkward miscreant at the center of “War Dogs,” surrounds himself with paraphernalia from the movie “Scarface.” A still of Tony Montana and his “little friend” hangs on the wall of Efraim’s Miami office, a cut-rate military contractor called AEY; when Efraim gives his partner and best friend, David Packouz (Miles Teller), a sentimental gift, it’s a gold-plated hand grenade, inscribed with a quote from the film: The World Is Yours. The poster for “War Dogs” is even reminiscent of the one for “Scarface,” which offers the first clue to why the new movie doesn’t work.