The cast and more celebrities at the ‘Semper Fi’ premiere in Los Angeles on Sept. 24. ‘Semper Fi’ will be released on Oct. 4. The movie follows Cal (Jai Courtney), a by-the-book police officer who, along with his close-knit group of childhood friends, makes ends meet as a Marine Corps reservist. When Cal’s reckless younger half-brother, Oyster, is arrested after a bar fight and given an unfair prison sentence, Cal – driven by his loyalty to family and fierce code of honor – fights for Oyster (Nat Wolff) in this gripping tale of brotherhood and sacrifice. The movie also stars Leighton Meester, Finn Wittrock, Beau Knapp, and Arturo Castro. ‘Semper Fi’ was written and directed by Henry-Alex Rubin. The movie will be available in theaters, On Demand, and Digital HD. See more photos of the ‘Semper Fi’ premiere in our gallery now.