NELLIS AIR FORCE BASE, Nev.—Master Sgt. Erica Perez, 99th Medical Group diagnostic imaging superintendent, performs an ultrasound procedure at the Mike O’ Callaghan Federal Hospital here Feb. 11. Master Sgt. Perez received the Chief Master Sgt. Anton Zembrod Award for the outstanding Air Force diagnostic imaging senior noncommissioned officer of the year. (U.S. Air Force photo by Senior Airman Nadine Y. Barclay)
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