A DC-10 Super Tanker aircraft dumps flame retardant as firefighters battle a blaze in San Marcos, California May 14, 2014. California fire crews, helped by diminished overnight winds, made substantial headway by early Wednesday against a blaze that had prompted thousands of evacuations in and around San Diego for several hours while flames were at their peak. REUTERS/Sam Hodgson (UNITED STATES - Tags: ENVIRONMENT DISASTER)