Marine Corps Gunnery Sgt. Michael D. Brown, foreground, calls out directions during an amphibious assault operation on the Potomac River on Marine Corps Base Quantico, Va., July 21, 2014. Brown is assigned to Echo Company, 4th Reconnaissance Battalion. The training exercise was part of a weeklong jump, dive, breach and shooting package conducted around various ranges on the base. Marine Corps Gunnery Sgt. Michael D. Brown, foreground, calls out directions during an amphibious assault operation on the Potomac River on Marine Corps Base Quantico, Va., July 21, 2014. Brown is assigned to Echo Company, 4th Reconnaissance Battalion. The training exercise was part of a weeklong jump, dive, breach and shooting package conducted around various ranges on the base. SHARE: Download: Full Size (1.81 MB) Tags: Photo Essays Credit: VIRIN: 965899-S-DSE19-854.jpg Photo Gallery