Air Greenland helicopter pilot Nicklas Altin, left, and U.S. Army Maj. Jeremiah Ellis demonstrate the how to attach sling load hooks for 55-gallon barrels to North South Polar's project manager, Joe Tuttle, and chief scientist Alberto Behar on a glacier near Koge Bay, Greenland, Aug. 7, 2013. The crew flew to the island where they conducted 18 sling loads of 55-gallon barrels of fuel destined for the excavation site during the mission to locate a missing World War II U.S. Coast Guard J2F-4 Grumman Duck aircraft. (U.S. Coast Guard photo by Petty Officer 2nd Class Jetta H. Disco)