Solar Still Marine Corps Sgt. Maj. Mike Grunst and Sgt. Robert Morrill dig a hole for a solar still during Khaan Quest 2016 in Ulaan Bataar, Mongolia, May 27, 2016. The exercise is a survival training course for U.S., Mongolian and Czech forces. Navy photo by Petty Officer 3rd Class Markus Castaneda SHARE: Download: Full Size (1.17 MB) Credit: Petty Officer 3rd Class Markus Castaneda VIRIN: 160527-N-WI365-128.JPG Photo Gallery