Petty Officer 2nd Class Roberto Vasquez, from Los Angles, performs maintainance on the cockpit of an SH-60F Seahawk assigned to the "Black Nights" of Helicopter Anti-Submarine Squadron 4. As Seaman Vasquez performs preventative and corrective maintainance on electronic systems of an aircraft. Ronald Reagan and Carrier Air Wing 14 are underway conducting a sustainment exercise in the Pacific Ocean.