U.S. Army soldiers plot eight-digit grid coordinates on a map U.S. Army soldiers plot eight-digit grid coordinates on a map before participating in a daytime land navigation course while competing for the Expert Field Medical Badge at Joint Base Lewis-McChord, Wash., on April 10, 2013. The badge is awarded to soldiers in medical professions who pass a variety of tests designed to measure proficiency in medical procedures, tactical skills and physical conditioning. SHARE: Download: Full Size (0.1 MB) Credit: VIRIN: 505819-Q-MBW21-516.jpg Photo Gallery