This photo obtained August 30, 2013 courtesy of the US Forest Service, shows a Hotshot walking the fire line on August 29, 2013. The wildfire threatening Yosemite National Park is spreading further into the US tourist landmark, officials said as they battled to stop it clouding a holiday weekend. Efforts to contain the so-called Rim Fire, which has grown to become California’s sixth biggest wildfire ever, were also being boosted by the deployment of a military drone approved by the Pentagon. The fire, which now covers more than 192,000 acres, or 300 square miles, and is 30 percent contained, has also threatened San Francisco’s water supply, due to ash falling on a key reservoir. AFP PHOTO / US FOREST SERVICE/Mike McMillan == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: “AFP PHOTO / US FOREST SERVICE/ Mike McMillan/ NO MARKETING / NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS ==