Airman 1st Class Kristopher Esparza, 28th Logistics Readiness Squadron Aircraft Parts Store technician, dons his backpack after it was X-rayed during a deployment readiness exercise at the Deployment Center on Ellsworth Air Force Base, S.D., Dec. 14, 2012. Esparza was one of approximately 164 Airmen who participated in the exercise hosted by the 28th LRS. (U.S. Air Force photo by Airman Ashley J. Woolridge/Released)