As home to supermajors, as well as a plethora of smaller, independent energy players, the US boasts one of the largest concentrations of energy personnel in the world. With its insatiable appetite for energy resources, the United States is the world's single largest consumer of oil, using as much as 20.73 million barrels per day as of 2008. Recently, interest has peaked in the vast quantity of untapped natural gas resources in the US, the reserves of which were inventoried in 2008 at 238 Tcf, with producers specifically targeting the nation's promising shale formations for this energy commodity.
The Chief Mate, or Chief Officer, is a licenced crew member that is second in command of the vessel. The Chief Mate or Officer reports directly to the Captain and is responsible for the Deck Department and Cargo along with commanding all of the crew in those departments. The Chief Mate or Officer holds the same rank as First Mate or Officer and a crew will usually only have one or the other. Below Chief/First Mate or Officer will be Second Mate/Officer, Third Mate Officer, and so on depending on the size of the vessel.