Google Earth Community: Cessna O-2 at San Jose, CA.

California Department of Forestry Cessna O-2 at San Jose.

The O-2 is the military version of the Cessna 336/337 Skymaster used as Forward Observers.

http://en.wikipedia.org/wiki/Cessna_Skymaster

'In the mid-1970s, CDF found that the contractor-owned air tactical planes, mostly single-engine Cessna 182s and Cessna 210s, did not provide the airspeed and safety needed for the new air tanker program. In 1974, CDF acquired 20 retired USAF Cessna O-2 observation aircraft from Davis-Monthan Air Force Base. These O-2s had been forward air control aircraft in Vietnam, had been shipped back to the United States in containers and were disassembled and on pallets when they arrived at CDF's Fresno maintenance facility. A crew of California Conservation Corp (CCC) members reassembled the aircraft. They were placed in service in 1976. The O-2 program was a success and served the Department for more than 20 years.'

Source