621st CRW Vigilant Guard Exercise
(From left to right) Capt. Brian Loveless, Staff Sgt. Joseph Reed and Capt. Luke Stumme, members of the 817th Contingency Response Group's "Alpha Mike" airfield assessment team, conduct soil density tests beneath a runway during the Vigilant Guard exercise in Puerto Rico, March 23-29. The completed assessment will be used "real-world" to certify the runway for use by various mobility aircraft. (U.S. Air Force photo/1st Lt. Dustin Doyle)