Operation Marked The First Use Of The R-20 At The Base To Conduct Hot-Pit Refueling For the first time under new circumstances, U.S. Airmen assigned to the 332nd Expeditionary Logistics Readiness Squadron conducted a hot-pit refueling operation using an R-20 expeditionary refueling system to support a U.S. Army UH-60 Black Hawk helicopter on a flightline within the U.S. Central Command area of responsibility, Dec. 14, significantly reducing aircraft ground time and expanding expeditionary fueling capabilities.