Coast Guard Base Alameda also referred to as Coast Guard Island is an artificial island in the Oakland Estuary between Oakland and Alameda, California. It is home to several major United States Coast Guard commands and cutters, including the Coast Guard Pacific Area. It is one of the largest Coast Guard bases on the West Coast. From 1942 until 1982, the island was the site of the Coast Guard’s recruiting training center (boot camp), enlisting and training hundreds of thousands of Coasties including many of the 214,239 who served in the Pacific and European Theaters of World War II.
The 67-acre island is situated in the historic Brooklyn Basin, now known as Embarcadero Cove. It is within Alameda city limits, but is tied to land only via a bridge from Dennison Street in Oakland.
It is also the homeport for four Legend-class cutters:
Source: Wikipedia