After graduation, he initially served aboard the surface ships and before attending Submarine School.
Submarine service
His first submarine assignment was the diesel. He underwent nuclear power training, followed by assignment to the nuclear-powered submarines,, and before taking command of. His shore duty stations include being an instructor at the Nuclear Power School and Submarine School and attending the Armed Forces Staff College. After staff duty with Squadron Ten, DeMars served as Senior Member of the Nuclear Propulsion Examining Board, United States Atlantic Fleet. He commanded Submarine Development Squadron Twelve in New London, Connecticut and then served as Deputy Director, Attack Submarine Division in the Office of the Chief of Naval Operations, until selected for promotion to Rear Admiral in 1981. Admiral DeMars was the “Father” and Leader for the Cold War and Post Cold War battle for submarine supremacy of the United States Navy. With clear and documented intelligence information, mostly as a result of the Walker Whitworth espionage cases, the USSR NUCLEAR Submarine Operational and Stealth Technology had achieved major advances compared to the historical superiority of the United Staes Submarine Force which was well documented by the U.S. Intelligence Community and Operational Experience. As a result and as a major initiative Admiral DeMars took the leadership role and Challenged the United States Submarine Leadership, the Submarine Technology Centers and the Submarine Military Industrial Complex to take immediate and effective action to restore the American Worldwide Submarine Stealth and Operational Superiority. Within a short period of less than four years the Submarine Acquisition Programs had established a fully integrated series of design and technology advances and improvements as evidenced by the advanced SSN 688I Class, the SEAWOLF SUBMARINES: SSN 21, SSN 22, and SSN 23, the ARCI fully integrated forward fit and backfit program for all U.S. Submarines coupled with the Virginia Class Design, Development and Delivery of a series of Submarines with major stealth and sensor advances far exceeding any technology of submarines in the World. Admiral DeMar’s consistent, persistent and demanding approach was the primary incentive and the incentivised series of detailed plans and designs to achieve this success.
