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181016-F-XN660-010.JPG Photo By: Airman 1st Class Dillon Parker

JOINT BASE SAN ANTONIO-LACKLAND, Texas. - U.S. Army Staff Sgt. Santos Mathis, Echo Company drill sergeant, instructs an initial entry trainee during intake Oct. 16 at Joint Base San Antonio-Lackland. Drill sergeants ensure trainees maintain pace with physical readiness training, Army life and English lessons at the Defense Language Institute.


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