SAN FRANCISCO - Former Coast Guard Air Station San Francisco crewmembers look at and discuss posterboards representing the seven decades of Air Station San Francisco operations prior to a ceremony marking the unit's 70th anniversary, Wednesday, Oct. 5, 2011. Air Station San Francisco was established in 1941 with missions in search and rescue, law enforcement, port security, and environmental protection in the Bay Area spanning over 300 miles of coastline, from Fort Bragg to Point Conception. U.S. Coast Guard photo by Dan Dewell.