The host unit at March is the Air Force Reserve's 452d Air Mobility Wing (452 AMW), which in addition to its operational flying mission, also provides host base support for numerous tenant units.
March JARB is also the home to Headquarters, Fourth Air Force (4 AF) of the Air Force Reserve Command and multiple units of the California Air National Guard.

452d Air Mobility Wing
452nd Operations Group
336th Air Refueling Squadron
729th Airlift Squadron
912th Air Refueling Squadron (Active Duty "Associate" Squadron)
452nd Maintenance Group
452nd Mission Support Group
452nd Medical Group
1st Combat Camera Squadron Operating Location Charlie (established late 2017)
The host unit at March is the Air Force Reserve's 452d Air Mobility Wing (452 AMW), which in addition to its operational flying mission, also provides host base support for numerous tenant units. March JARB is also the home to Headquarters, Fourth Air Force (4 AF) of the Air Force Reserve Command and multiple units of the California Air National Guard.
452d Air Mobility Wing
452nd Operations Group
336th Air Refueling Squadron
729th Airlift Squadron
912th Air Refueling Squadron (Active Duty "Associate" Squadron)
452nd Maintenance Group
452nd Mission Support Group
452nd Medical Group
1st Combat Camera Squadron Operating Location Charlie (established late 2017)
March Air Reserve Base