Placed in service again on 3 August 1912, "Saturn" returned to duty with the Pacific Fleet. She operated out of California, Washington, and Mexican ports supporting fleet activities until placed in reserve on 31 July 1913 at Puget Sound Naval Shipyard. "Saturn" was placed in service on 4 April 1914 and deployed to Mexican waters to protect United States citizens while the Mexican political situation deteriorated. "Saturn" spent much of 1914 anchored at Mazatlán, Manzanillo, and La Paz, Mexico, and returned to United States waters early in the following year. The collier remained in service in waters from Mexico to Washington into September 1916.