A tug boat helps guide the Los Angeles-class submarine USS Toledo through the Thames River to Naval Submarine Base New London, Conn., following a regularly scheduled deployment, Jan. 20, 2011.The USS Toledo conducted operations in U.S. Africa Command and U.S. Central Command areas of responsibility. Defense Secretary Ash Carter will visit the submarine base during his May 23-25 visit to New England. Navy photograph by Petty Officer 1st Class Virginia K. Schaefer