U.S. Air Force Airman 1st Class Evelyn Alvarado, 633rd Aerospace Medical Squadron public health technician, conducts a periodic health assessment at Langley Air Force Base, Va., April 8, 2014. PHAs are a vital part of individual medical readiness as a Service member must receive one to be eligible to deploy. Alvarado hails from El Paso, Texas. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)