Joint POW/MIA Personnel Accounting Command forensic photographer Staff Sgt. Brian Kimball uses a plumb line to measure two meter spacing along radial lines from datum 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, the team can begin melting bore holes in order to lower a subsurface camera to look for 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.