1st Marine Expeditionary Brigade (MEB) is a unit in the I Marine Expeditionary Force (I MEF) and is the "middleweight" global crisis response force. It is able to "operate independently, as a service component, or to lead a Joint Task Force" .
The brigade was stationed at Kaneohe Bay Marine Corps Air Station until 1992. From 1976 to 1981 while at Kaneohe (now known as Marine Corps Base Hawaii), the unit was designated as the 1st Marine Brigade. In addition to the Brigade Headquarters Group as its Command Element (CE), the 1st Marine Brigade consisted of the 3rd Marine Regiment as its Ground Combat Element (GCE), Marine Aircraft Group 24 (MAG-24) as its Aviation Combat Element (ACE), and a Brigade Service Support Group (BSSG) as it Logistics Combat Element (CLE).
- Command Element - Battalion equivalent headquarters organization, formed of companies/detachments sourced from the parent MEF HQ Group and staff, and with the Deputy MEF Commander as the MEB Commander.
- Ground Combat Element - Regimental Combat Team (RCT) consisting of a reinforced Marine Infantry Regiment.
- Aviation Combat Element - Marine Aircraft Group (MAG), consisting of a combination of rotary-wing, tiltrotor, and/or fixed wing aircraft squadrons/detachments and aviation support squadrons/detachments, capable of conducting all six functions of Marine aviation including offensive air support, assault support, electronic warfare, control of aircraft and missiles, anti-air warfare and aerial reconnaissance.
- Logistics Combat Element - Combat Logistics Regiment (CLR), consisting of from 1 to 3 Combat Logistics Battalions (CLB) and capable of providing full-spectrum Combat Service Support to all elements of the MEB.