Born and raised in Austin, Texas, Master Chief Sepulveda enlisted into the United States Navy in August of 1987. Upon completion of Basic Training at Recruit Training Command Great Lakes, he continued on to Navy Training Command Great Lakes and attended Gunner’s Mate “A” and “C” schools. He was the Honor Graduate for both his “A” and “C” schools.

Prior to his selection as a Command Master Chief (CMC), Master Chief Sepulveda’s afloat commands include, USS Mahan (DDG 42) as a missile and gun system technician, USS Exultant (MSO 441) as Ships Armorer, USS Monterey (CG 61) as a plank owner and CG Division Leading Petty Officer, USS Paul F. Foster (DD 964), as the Department Leading Petty Officer, USS Decatur (DDG 73), also as a plank owner and Division Leading Chief Petty Officer, and the USS John Paul Jones (DDG 53), as the Department Leading Chief Petty Officer. Within his combined 19 years of sea duty, he attained his Enlisted Surface Warfare Specialist and Afloat Training Specialist designations, Tactical Action Officer, Combat Warfare Coordinator for air, surface and sub-surface watch stations, Officer of the Deck underway, and has served as a Lead Trainer on the Combat System, Anti-Terrorism, Damage Control and Seamanship Training Teams, throughout his sea tours and numerous deployments.

Ashore, Master Chief Sepulveda's commands include, NAVMARCORESCEN Jacksonville, FL, as an instructor and Leading Petty Officer, Regional Support Organization San Diego, as the Combat Systems Officer and INSURV Inspector, and at the Center for Surface Combat Systems Detachment West San Diego, as the Gunner's Mate Rating Lead and Senior Enlisted Leader. He has completed numerous Anti-Terrorism Training Programs and certifications, as well as Gunner's Mate related "C" and 'F" schools and is a qualified Master Training Specialist Mentor.

Upon selection for the Command Master Chief program, Master Chief Sepulveda’s initial CMC tour was at the Center for Surface Combat Systems San Diego from June 2009 Until October 2011. His follow on assignment was as Command Master Chief for Helicopter Sea Combat Squadron SIX (HSC 6) Screaming Indians, from November 2011 until May 2014. HSC 6 was attached to Carrier Air Wing ELEVEN, which was embarked and deployed onboard USS NIMITZ (CVN 68). While deployed he attained his Enlisted Aviation Warfare Specialist designation. He reported in May of 2014 as the Wing Command Master Chief for Commander, Helicopter Maritime Strike Wing U. S. Pacific Fleet, based out of Naval Base Coronado.

Master Chief Sepulveda is a graduate of the Senior Enlisted Academy, Class # 161 Blue Group and the Command Leadership Capstone Course, Class # 93. He has earned a Bachelor’s Degree in Criminal Justice, with a specialty in Homeland Defense and was the Commander, Navy Helicopter Sea Combat Wing U. S. Pacific Fleet recipient of the FY 2011 peer selected Leadership Award. His personal awards include the Meritorious Service Medal, Navy Commendation Medal (four awards), Navy Achievement Medal (six awards), and various unit, service and campaign awards.