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.
Lt. Col. Calischaran G. James was relieved of his duties by Maj. Gen. Marcus B. Annibale, the 1st Marine Aircraft Wing commanding general.
Master-at-Arms 1st Class Jeffrey Diaz died after attempting to rescue children from high surf at a Kauai beach over the weekend, authorities said.
By Beth Sullivan
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