151114-N-KB426-130 NATIONAL CITY, Calif. (Nov. 14, 2015) Culinary Specialist 2nd Class Patrick Dennis, left, assigned to amphibious assault ship USS America (LHA 6), picks up trash during a semiannual �Main Street Cleanup� community relations event. Naval Base San Diego (NBSD) hosts the event twice a year in an effort to improve the appearance of areas in San Diego and maintain a positive relationship with the communities surrounding the base. (U.S. Navy photo by Mass Communication specialist 3rd Class James Vazquez/Released)