About 450 U.S. Marines were deployed to the Joint Task Force-Southern Border in Yuma, Arizona, this month to boost security along the southern border.
Pfc. Tanner F. Rubio, 21, died Dec. 3 following a tactical training vehicle mishap.
The activation comes as part of the Corps' Force Design 2030 recalibration toward agile logistics in the contested island chains of the Pacific.
Lt. Col. Calischaran G. James was relieved of his duties by Maj. Gen. Marcus B. Annibale, the 1st Marine Aircraft Wing commanding general.
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