U.S. Air Force Master Sgt. Joshua Selby, ramp coordinator with the Kentucky Air National Guard’s 123rd Contingency Response Group, prepares to drill into the runway at Amedee Army Airfield, Calif., to get a core sample to test the strength of the concrete on March 6, 2016. The 123rd CRG is working in conjunction with the U.S. Army’s 688th Rapid Port Opening Element and a team from the Defense Logistics Agency to operate Joint Task Force-Port Opening Sangala during a week-long exercise called Operation Lumberjack. The objective of the JTF-PO is to establish an aerial port of debarkation, provide initial distribution capability and set up warehousing for distribution beyond a forward node. (Kentucky Air National Guard photo by Master Sgt. Phil Speck)