An MH-60S Seahawk helicopter delivers cargo pallets to the USS Carter Hall (LSD 50) from USNS Big Horn (T-AO 198) Dec. 8, 2016, while executing a vertical replenishment during the Amphibious Ready Group Marine Expeditionary Unit Exercise Dec. 8, 2016. During the three-week training evolution, Marines will tackle a wide range of operations and scenarios enhancing interoperability and amphibious warfare capabilities with their Navy counterparts. Replenishment at sea is vital for the Bataan Amphibious Ready Group to sustain itself while underway. (U.S. Marine Corps photo by Gunnery Sgt. Adaecus G. Brooks)