Shortly after returning from Iraq, CAPT Vaughn transferred to the nascent Riverine Group ONE (RIVGRU 1), in Little Creek, Virginia. As Group Surgeon for RIVGRU 1, he assisted in establishing and deploying three new Riverine Squadrons to Iraq where they conducted integrated river combat operations with Coalition and Iraqi Security Forces. In August of 2009, CAPT Vaughn reported to the Navy and Marine Corps Public Health Center and assumed duties as the Health Promotions Division Officer. In 2010, he became the Deputy Director of the Expeditionary Preventive Medicine Directorate and in that capacity oversaw the reunification of the Navy Environmental and Preventive Medicine Units under the Public Health Center. In December 2010, he deployed to Kabul, Afghanistan as the International Security Assistance Force Preventive Medicine Officer, providing advice and policy guidance for the care of over 120,000 coalition troops. Upon his return from Afghanistan in 2011, he became the Officer-in-Charge of Navy Environmental and Preventive Medicine Unit TWO in Norfolk, Virginia. In this capacity, he was responsible for providing force health protection, environmental health, industrial hygiene, sentinel microbiology, disease outbreak control and entomology support to Navy and Marine Corps assets in an area of responsibility that covered the eastern U.S., South America, Africa, Europe and the Middle East. CAPT Vaughn was promoted to his current rank in September of 2012. In September of 2013, he transferred to become Director, Naval Medical Research Unit TWO Detachment Phnom Penh, Cambodia under the aegis of the Naval Medical Research Center - Asia, located in the Republic of Singapore. In June of 2016, after three years in Cambodia, he transferred to the U.S. Naval Medical Research Unit THREE (NAMRU-3) in Cairo, Arab Republic of Egypt assuming the duties as the executive officer. CAPT Vaughn assumed command of NAMRU-3 in September of 2016. During his tenure, NAMRU-3 initiated and maintained research projects in nine countries across the Middle East and Africa and began the transition to its new home in Sicily.
CAPT Vaughn’s awards include the Defense Meritorious Service Medal, Meritorious Service Medal with a Gold Star, Navy Commendation Medal with two Gold Stars, Afghanistan Campaign Medal, Iraq Campaign Medal and the NATO-ISAF Medal.