Maximilian Carlo Martini (born December 11, 1969) is an American actor, writer, and director known for his roles as Corporal Fred Henderson in Saving Private Ryan, Wiley in Level 9, First Sergeant Sid Wojo in The Great Raid, and as Master Sergeant Mack Gerhardt in the military drama television series The Unit. He also starred in the film 13 Hours: The Secret Soldiers of Benghazi. He was also a guard in The Divergent Series: Allegiant.