LOS ANGELES -- Lt. Cmdr. Christopher Boes, Incident Management Division Chief of Sector Los Angeles-Long Beach, explains the layout of the Ports of Los Angeles and Long Beach to students from Oak Park High School in Oak Park, Calif. Dec. 16, 2009 during a tour of the ports aboard a 41-foot Utility Boat from Station Los Angeles-Long Beach. The students are researching the effects of commerce on the marine environment for a school project. U.S. Coast Guard photo by Petty Officer 3rd Class Cory J. Mendenhall.