Airmen from the 19th Civil Engineer Squadron fill sandbags to harden shelters during phase II of ROCKI 20-01 at Little Rock Air Force Base, Arkansas, Nov. 12, 2019. Sandbags were placed around the cabins in the simulated deployed location to protect the shelters from simulated attacks. (U.S. Air Force photo by Airman 1st Class Mariam K. Springs)