CALSTAR (California Shock Trauma Air Rescue) is a nonprofit regional air medical services company serving California and northern Nevada. It is currently the largest nonprofit air ambulance provider on the West Coast. CALSTAR was founded as a non-profit public-benefit corporation in 1983, and began flight operations the following year using a leased BK 117 helicopter based at Peninsula Hospital in San Mateo, California. In its first year, CALSTAR flew 235 patients. By 2010, CALSTAR’s operations had grown to ten helicopter EMS bases located throughout Northern and Central California and a fixed wing program providing inter-facility transport services from the company’s headquarters at McClellan Park (formerly McClellan Air Force Base) in Sacramento, California.