On August 9, 1917, Commander John J. Snyder, M. C. U. S. N., reported aboard as the first Senior Medical Officer. The plans for the medical department were submitted to Dr. Snyder and to the Naval Constructor, and were later adopted by the Bureau of Medicine and Surgery. Before the first trip three more medical officers reported, viz: Lieut. Commander G. T. Vaughan, U. S. N. R. F., Lieut. Max M. Braff, M. C. U. S. N., and Lieut. S. Strauss, M. C. N. N. V., so that on the first trip there were five medical officers, besides the Senior Medical Officer. After the trial trip to Cuba the _Leviathan_ went to Liverpool. The amount of work was found to be too much for the number of doctors, and upon returning to the States another Medical Officer was requested. Lieut. A. K. Dunlap, M. C. U. S. N., was sent aboard in February, 1918, so that on the second trip seven doctors were aboard. On subsequent trips into New York, Lieut. Robt. Lorentz, M. C. U. S. N., Chief Pharmacist C. I. Campbell, U. S. N. R. F., and Lieut. Edward Crofutt, M. C. U. S. N., were sent aboard for duty. During the month of May, 1918, Commander Snyder left to assume his new duties as Fleet Surgeon, and his position on board as Senior Medical Officer was assumed by Commander H. A. May, M. C. U. S. N. Lieut. Harold Hulbert, M. C. U. S. N., and Pharmacist F. B. Redman also joined the ship about the same time. Later in the summer the medical corps was further strengthened by the addition of Lieuts. Harry L. Howell and John E. Porter, U. S. Navy Medical Corps. In December, 1918, Dr. May was detailed to duty ashore and the duties of Senior Medical Officer assigned to Commander F. A. Asserson, M. C. U. S. N. Lieuts. Walter L. Rathbun, Thos. Sheppard, and A. T. Weston, M. C. U. S. R. F., reported at the same time. As new officers reported on board from time to time, others were relieved and detailed elsewhere. For the greater part of the time since the ship has been in commission the medical department has had nine doctors on board.