U.S. Air Force Airman 1st Class Evelyn Alvarado, 633rd Aerospace Medical Squadron public health technician, conducts a routine eye exam during a periodic health assessment at Langley Air Force Base, Va., April 8, 2014. The PHA is an assessment providing Airmen with preventive health services to maximize their wellbeing and to ensure their mobility readiness. Alvarado hails from El Paso, Texas. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)