Following his commissioning, from June to September 1965, Reason served as operations officer in
USS J. Douglas Blackwood (DE-219), before attending the
Naval Nuclear Power School at
United States Naval Training Center Bainbridge from September 1965 to March 1966, then attended the Naval Nuclear power training Unit at
Schenectady, New York from March to September 1966. On completion of his nuclear power training, Reason was assigned to
USS Truxtun (CGN-35) and participated in the ship's first deployment to Southeast Asia in 1968 during the
Vietnam War. In September 1969, he entered the
Naval Postgraduate School as a student, where he earned a
Master of Science degree in computer systems management. In December 1970, Reason was assigned to the nuclear aircraft carrier
USS Enterprise (CVN-65), in which he served until January 1973, making two deployments to the Southeast Asian and Indian Ocean areas. From January to August 1973, he attended the Naval Destroyer School at
Naval Station Newport,
Rhode Island, followed by the Combat System Technical Schools Command at
Mare Island from August 1973 through January 1974. Returning to
USS Truxtun (CGN-35), Reason served as her combat systems officer from January 1974 until June 1976. On completion of this sea assignment, Reason became a detailer for Surface Nuclear Junior Officer Assignment and Placement Branch,
Bureau of Naval Personnel in Washington until December 1976, when he was assigned to the
White House as Naval Aide to the President of the United States,
Jimmy Carter. In June 1979, he became executive officer of
USS Mississippi (CGN-40) and remained in that post until May 1981, when he was ordered to the Surface Warfare Officers School Command at
Newport, Rhode Island in preparation for assignment in command of
USS Coontz (DDG-40). Taking up his first command in September 1981, he remained in
USS Coontz (DDG-40), until December 1982. From sea duty, he was assigned to
Naval Reactors,
Department of Energy for instruction until April 1983, when he took command of the nuclear-powered guided missile cruiser
USS Bainbridge (CGN-25) until July 1986, during which period he was promoted to
captain on 1 October 1983. Selected for promotion to
rear admiral (lower half) on 26 June 1986, he served as commander, Naval Base,
Seattle, Washington from July 1986 to September 1988, in which position he was responsible for all naval activities in the states of
Washington,
Oregon, and
Alaska. Returning to sea duty, he commanded
Cruiser-Destroyer Group 1 until November 1990, then, promoted to
rear admiral (upper half). At the same time, he commanded Battle Group Romeo aboard the flagship
USS New Jersey (BB-62) in operations in the Pacific, Indian Ocean, and Persian Gulf regions. Following his selection to
Vice Admiral in 1991, he commanded Naval Surface Forces, U.S. Atlantic Fleet, from January 1991 to July 1994. From August 1994 to November 1996, Reason served as Deputy Chief of Naval Operations, Plans, Policy, and Operations (N3/N5). In November 1996, he was selected for promotion to four-star admiral and assigned as Commander in Chief,
United States Atlantic Fleet until he retired from active duty in 1999. ==Post-military career==