MLT
Airman 1st Class Roger Smith III, 1st Special Operations Medical Support Squadron medical laboratory technician, performs a blood chemistry test at Hurlburt Field, Fla., April 14, 2014. Medical lab techs perform tests on blood, urine and other samples collected from patients to help doctors diagnose illnesses and diseases. (U.S. Air Force photo/Airman 1st Class Jeff Parkinson)