Airman Daniel Black, 28th Munitions Squadon munitions, tightly secures inert cluster bomb units during an Operational Readiness Exercise at Ellsworth Air Force Base, S.D., March 15, 2012. MUNS personnel are responsible for safely building, loading, transporting and securing the bomb units for transport. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)