Coast Guard District 17 commander, Rear Adm. Thomas Ostebo, addresses senior local, federal, state and industry leaders during the Arctic Spill of National Significance seminar June 18, 2013, in Anchorage, Alaska. A spill of national significance is a spill that, due to size, location actual or potential impact on the environment or the necessary response effort, is so complex it requires extraordinary coordination of federal, state, local and responsible party resources to contain and clean up the discharge. (U.S. Coast Guard photo by Petty Officer 1st Class Shawn Eggert)