Senior Airman Samuel Chavez, 379th Expeditionary Medical Operations Squadron bioenvironmental engineering technician, shows Lt. Gen. Jeffrey L. Harrigian, U.S. Air Forces Central Command commander, bioenvironmental equipment used for occupational health surveillance and response equipment used in emergencies during a 379th Air Expeditionary Wing tour Aug. 11, 2016, at Al Udeid Air Base, Qatar. The tour included stops at the 379th Expeditionary Medical Group, Bioenvironmental Flight, Intra-Theater Care Program, Mental Health, a Cadillac in the process of renovation and the Doublestacks living complex. (U.S. Air Force photo/Senior Airman Janelle Patiño/Released)