Joint POW/MIA Personnel Accounting Command forensic anthropologist Mindy Simonson uses a hand-held compass to mark radial lines from a datum marker to determine where a series of flags will be placed, on a glacier near Koge Bay, Greenland, Aug. 13, 2013. Once the flags are set with two meter spacing, the team can begin melting bore holes to lower the subsurface camera in search of 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.