Commandant wants to see Marines fighting in a new way by 2023 1 hour ago Marines board an MV-22 Osprey during an expeditionary advance base operation exercise at Camp Schwab, Okinawa, Japan, June 17, 2020. (Cpl. Donovan Massieperez/Marine Corps) Every time Marines head to the field they’ll have a chance to experiment with how the force will fight future battles. That’s in part because Marine Corps Commandant Gen. David Berger has set down a strict deadline of 2023 for Marines to offer a new way of operating in the increasingly challenging areas against peer adversaries such as Russia and China. As a guide, Marines will look to a recently published “Tentative Manual for Expeditionary Advanced Base Operations,” or EABO. The concept puts Marines in small teams focused on sea denial to help the Navy fight a peer adversary.