Airman 1st Class Jacob Fonseca, and Jeremiah Daughterly, 779th Medical Group medical laboratory Phase II students, prepare and run chemistry tests on a patient’s blood sample on Jan. 31, 2013 at Joint Base Andrews, Md. These tests are used to detect a wide range of medical conditions and improper organ functions. (U.S. Air Force photo/Airman 1st Class Erin O’Shea)