U.S. Army engineers deploy watercraft to push Improved Ribbon Bridge partitions into place to construct a floating bridge across the Arkansas River as part of the River Assault 2015 training exercise on Fort Chaffee, Ark., Aug. 4, 2015. U.S. Army engineers deploy watercraft to push Improved Ribbon Bridge partitions into place to construct a floating bridge across the Arkansas River as part of the River Assault 2015 training exercise on Fort Chaffee, Ark., Aug. 4, 2015. SHARE: Download: Full Size (1.12877 MB) Tags: photo essays Credit: VIRIN: 951740-R-MVN39-015.jpg Photo Gallery