U.S. Army Staff Sgt. Clarence Clark launches a Raven unmanned aerial vehicle in Fort Indiantown Gap, Pa., May 19, 2010. Clark is assigned to the 1st Battalion, 107th Field Artillery, Pennsylvania Army National Guard. U.S. Army Staff Sgt. Clarence Clark launches a Raven unmanned aerial vehicle in Fort Indiantown Gap, Pa., May 19, 2010. Clark is assigned to the 1st Battalion, 107th Field Artillery, Pennsylvania Army National Guard. SHARE: Download: Full Size (1.44 MB) Tags: Photo Essays Credit: VIRIN: 090706-R-SLU03-141.jpg Photo Gallery