Valve Work Pennsylvania Air National Guard Staff Sgt. Emery Barrett and Airman 1st Class Reanna Keener move a shuttle valve to the correct side of an aircraft brake assembly in Middletown, Pa., April 5, 2017. Air National Guard photo by Master Sgt. Culeen Shaffer SHARE: Download: Full Size (1.66 MB) Tags: Guard, Air Force, Airmen Credit: Master Sgt. Culeen Shaffer VIRIN: 170405-Z-HT970-007A.JPG Photo Gallery