Lt. Cmdr. Rob Tucker, U.S. Coast Guard team leader, right, and Jaana Gustafsson, a geophysicist with North South Polar, place flags two meters apart on a radial line extending from datum, on a glacier near Koge Bay, Greenland, Aug. 13, 2013. Once the flags are set, the team can begin melting bore holes to use a subsurface camera to locate a U.S. Coast Guard World War II-era J2F-4 Grumman Duck aircraft that reportedly crashed at that site on Nov. 29, 1942. U.S. Coast Guard photo by Petty Officer 2nd Class Jetta H. Disco.