In 1903 he decided to join the US Navy, entering with a rank of Lt (JG) in the Navy Civil Engineer Corps (CEC). He was immediately assigned to projects at the New York Navy Yard as Assistant Engineer, rebuilding dry dock #2 and other facilities. He was assigned as principal assistant in charge of construction in Charleston Navy Yard. The contractor was attempting to use sub-grade materials and threatened him with transfer if he didn’t allow the use of these materials. He stood his ground, and was subsequently transferred to Key West. But local papers focused on the story of a young man doing his best for the country and that got the attention of President Theodore Roosevelt – the orders were rescinded and the company backed down. Harris continued to do exemplary work at Charleston. In the early 1910’s, two major dry dock projects were beset with problems. The “Hoodoo Dry Dock” at the
Brooklyn Navy Yard had a major structure failure during construction. Several methods had been tried, unsuccessfully. Harris was consulted and he recommended a heavy reinforced concrete solution for building on deep shifting sands. The solution worked, and the dry dock was completed in 1912. In the second case, problems were encountered in the construction of the new Dry Dock No. 1 at Pearl Harbor, Hawaii. This was to be a 1001’ dock with a 32’ depth of water to the keel blocks, again with major hydrostatic design issues. Harris was a member of a consulting team led by Alfred Nobel (the American engineer), and he provided the key ideas and insights to resolve the issue and successfully complete the dock. This dock was of course very important in recovering from the Japanese bombing attack on Dec 7, 1941, when 7 battleships were sunk or damaged. Several of the battleships were raised and partially repaired in the Dock #1 before going to the west coast for complete repairs. In 1913, Lt. Harris was promoted to Lt. Commander. He continued his work in New York and added additional duties in Philadelphia – in charge of public works at the Philadelphia Navy Yard. His ability to see a problem and solve it, and to design and construct appropriate solutions came to the attention of key people. A Brooklyn congressional delegation recommended to the Navy that he be appointed as the next Chief for the Navy’s Bureau of Yards and Docks. The recommendation was quickly implemented. On January 17, 1916, President Woodrow Wilson appointed Lt. Commander Harris as Chief of the Bureau of Yards and Docks. This included a promotion, skipping the ranks of Commander and Captain, to Rear Admiral. The youngest admiral in the Navy, at age 41. Harris was now in charge of the most influential of the Navy’s 5 bureaus – including the
Bureau of Construction and Repair (ships),
Bureau of Ordnance. This put him in charge of a large percentage ($100M out of $330M or 30%) of the total US defense budget at that time. And just in time for World War I. Admiral Harris was responsible for a number of large projects during World War I, and was awarded the Navy Cross for his services. In addition to a new Philadelphia dry dock and various other projects, Harris collaborated with Franklin D. Roosevelt on a plan to place a mine barrier across the North Sea, from the Orkney islands to the Norwegian coast. This was implemented and successfully reduced the ability of the German Navy to operate submarines in the North Atlantic. == Civilian engineering career ==