Eddie Andreini Sr. Airfield (Half Moon Bay Airport) is a public airport in San Mateo County, six miles (9 km) northwest of Half Moon Bay, California. The airport is on the Pacific Coast, south of San Francisco.HistoryThe Half Moon Bay Airport is about 20 miles south of San Francisco. It was built by the California State Highway Department for the U.S. Army in 1942 as an auxiliary airfield for Salinas Army Air Base.Known as Half Moon Bay Flight Strip, the airport supported Salinas AAF's ground support mission to train light observation and reconnaissance squadrons. These would have been light aircraft and fighters modified with camera equipment. Salinas Army Air base also had the mission of conducting coastal patrols. As such, the airfield would have been garrisoned by a detachment of the 301st Base Headquarters and Air Base Squadron. With the reorganization of the Army Air Forces that took place in the first quarter of 1944, the Site was transferred to Air Technical Service Command and garrisoned by its own unit, the 4159th Army Air Forces Base Unit (Air Base). The mission of this unit was to operate the airfield for emergency landings, transient aircraft, and training missions. Other than refueling aircraft, no aircraft services would have been available.On 1 June 1945 the War Department issued a five-year permit to the U.S. Navy to operate the Site as "Outlying Field, Half Moon Bay". Half Moon Bay field became an outlying field for Naval Air Station Moffett Field, to furnish facilities for utility aircraft providing target towing service for the Anti-Aircraft Training Center, Point Montara, California.