Naval Auxiliary Landing Field (NALF) San Clemente Island (ICAO: KNUC, FAA LID: NUC), also known as Frederick Sherman Field, is a military airport located on San Clemente Island in Los Angeles County, California, United States.

One of the primary military functions of San Clemente has been to support research and development of many of the Navy's weapon systems.

Today SCI's primary function is twofold: to support tactical training of the Pacific Fleet, and to continue as a key research and development facility.

In total, SCI is a unique combination of airfields, airspace and ranges unlike any other facility owned by the Navy.

To reduce the use of diesel fuel and prevent harmful emissions, the Naval facility on San Clemente Island installed three 225 kilowatt wind turbines.