This article argues that the US Army’s pursuit of Divisions as Units of Action is a mistake. It instead proposes shifting the Army force structure to Regimental Combat Teams (RCTs) as Units of Action, and Battalions as Units of Replacement, enabling more efficient logistics and sustainment across the force. It also highlights how these new unit formations align with joint expeditionary warfare that will frequently take place in urban areas and incur high casualties and resource consumption.