The Los Angeles-class submarine USS Alexandria (SSN 757). GROTON, Conn. (Dec. 18, 2010).

101218-N-7516W-307 GROTON, Conn. (Dec. 18, 2010)

Two tugboats push the Los Angeles-class submarine USS Alexandria (SSN 757) into port at Naval Submarine Base New London. 

Alexandria is returning from a scheduled six-month deployment.

(U.S. Navy photo by Mass Communication Specialist 3rd Class Timothy Walter).