USS C-4 (SS-15)

USS C-4 (SS-15) was a C-class submarine of the United States Navy. Her keel was laid down by Fore River Shipbuilding Company in Quincy, Massachusetts, under a subcontract from Electric Boat Company, as Bonita. She was launched on 17 June 1909 sponsored by Mrs. J. C. Townsend, and commissioned on 23 November 1909, Lieutenant F. V. McNair in command. She was renamed C-4 on 17 November 1911.

Service history
Assigned first to the Atlantic Torpedo Fleet, and later to the Atlantic Submarine Flotilla, Bonita plied east coast waters until May 1913, when she cleared Norfolk, Virginia for Guantanamo Bay, Cuba. Her tactical exercises and development operations continued here and from Cristobal, Panama Canal Zone, where she reported on 12 December 1913. In August 1917, sailing with two other submarines, she explored the suitability of Panamanian ports as advance submarine bases. Laid up at Coco Solo Canal Zone from 12 November 1918, C-4 was decommissioned there on 15 August 1919, and sold on 13 April 1920.