170915-N-NI812-084 ARABIAN GULF (Sept. 15, 2017) Chief Boatswain's Mate Alfonso Guerrero dons his chief petty officer combination cover during a chief petty officer pinning ceremony aboard the aircraft carrier USS Nimitz (CVN 68). Nimitz is deployed to the U.S. 5th Fleet area of operations in support of Operation Inherent Resolve. While in this region, the ship and its carrier strike group are conducting maritime security operations to reassure allies and partners, preserve freedom of navigation, and maintain the free flow of commerce. (U.S. Navy photo by Mass Communication Specialist 3rd Class Ian Kinkead/Released)