San Clemente Island (SCI) is the southernmost of the eight California Channel Islands. It lies 55 nautical miles (nm) south of Long Beach and 68 nm west of San Diego. The island is approximately 21 nm long and is 4-1/2 nm across at its widest point. Since 1934, the island has been owned and operated by various naval commands. More than a dozen range and operational areas are clustered within a 60 mile radius of the island. The Commander-in-Chief, Naval Forces, Pacific (CINCPACFLT) is the major claimant for the island, and Naval Air Station, North Island (NASNI) is responsible for its administration. For more information, check out these links: Navy Training and the SCI Environment   SCI Chronological Military History (1934-2000) SCORE Development History (1981-2007) Click on the image for Welcome Aboard San Clemente Island Range Complex - Information Booklet Click on the image for SCORE Development History (1981-2007)