Player Embed Code: Download Embed Share Showcasing Lethality Series: Lethality Task Force Leader Discusses Infantry Overhaul Defense.gov Sept. 19, 2018 | 29:39 Army Command Sgt. Maj. Jason Wilson, command sergeant major of the Close Combat Lethality Task Force, briefs reporters at the Pentagon, Sept. 19, 2018. The task force was established by Defense Secretary James N. Mattis in March to implement lethality and survivability improvements to U.S. squad-level infantry combat formations in the Army, Marine Corps and U.S. Special Operations Command.