Rear Admiral Mark Howard Buzby (born October 6, 1956) is a retired two-star admiral in the United States Navy. Admiral Buzby relieved RADM Robert D. Reilly Jr as Commander of the Military Sealift Command (MSC) on October 16, 2009 and served the position for about 3.5 years. On May 10, 2013, Admiral Buzby was relieved by RADM (select) Thomas K. Shannon and retired from 34 years of service.