The regiment comprises twenty units which are geographically dispersed throughout eight states from California to Alabama.

During World War II, the 23d Marines participated in the following campaigns: Kwajalein, Saipan, Tinian, and the Battle of Iwo Jima.

3d Battalion, 23d Marines was activated in Nov 1990 and deployed to Saudi Arabia for Desert Shield.

With this action, 3/23 became the first unit of the 2nd Marine Division to enter combat since World War II.

3/23 continued to advance as part of 8th Marines, fighting actions into Kuwait City when the ceasefire was called.

[7] In June, 2012, the 23d Marine Regimental Headquarters Company deployed to Barbados, Caribbean for Tradewinds 2012.