Master Sgt. David Carreon, assigned to the 554th RED HORSE, or Rapid Engineer Deployable Heavy Operational Repair Squadron Engineers, prepares to use a dynamic cone penetrometer at Kunsan Air Base, Republic of Korea, Sept. 4, 2020. The DCP is used to determine underlying soil strength by measuring the penetration of the device into the soil after each hammer blow. (U.S. Air Force photo by Senior Airman Mya M. Crosby)