An Army reserve soldier fires a M2 Browning .50-caliber machine gun during Operation River Assault, a training exercise involving Army engineers and other support elements to create a modular bridge on the water across the Arkansas River on a gun range at Fort Chaffee, Ark., Aug. 2, 2015. An Army reserve soldier fires a M2 Browning .50-caliber machine gun during Operation River Assault, a training exercise involving Army engineers and other support elements to create a modular bridge on the water across the Arkansas River on a gun range at Fort Chaffee, Ark., Aug. 2, 2015. SHARE: Download: Full Size (1.813454 MB) Tags: Photo Essays Credit: VIRIN: 383159-S-BMD29-486.jpg Photo Gallery