U.S. Army Combined Arms Center British Army Liaison Officer Col. James Walker speaks with Combined Arms Doctrine Directorate Deputy Director James Benn before a briefing to Director Land Warfare (Designate) Maj. Gen. Chris Barry at the Mission Command Center of Excellence headquarters Nov. 16, 2021. MCCoE leaders briefed Barry on topics of mutual interest including interoperability, information advantage, and doctrine and leader development. (U.S. Army photo by Randi Stenson, MCCoE Public Affairs)