150515-N-DB801-220 PEARL HARBOR (May 15, 2015) Cmdr. Patrick Friedman, right, passes command of the Los Angeles-class attack submarine USS Columbia (SSN 771) to Cmdr. David Edgerton during a ceremony overseen by Capt. Craig Blakely, commander of Submarine Squadron (SUBRON) 7. (U.S. Navy photo by Mass Communication Specialist 1st Class Steven Khor/Released)