190402-F-XA469-0030
U.S. Air Force Airman 1st Class Jonathan Valdes, 673d Air Base Wing Public Affairs photojournalist, uses pencil erasers to type photo captions, while in Mission Oriented Protective Posture 4, during exercise Polar Force 19-4 at Joint Base Elmendorf-Richardson, Alaska, April 2, 2019. The exercise is made up of a variety of scenarios which test JBER’s ability to handle real world situations.