Twentynine Palms Strategic Expeditionary Landing Field or Twentynine Palms SELF (ICAO: KNXP, FAA LID: NXP) is a military use airfield located nine nautical miles (17 km) northwest of the central business district of Twentynine Palms, a city in San Bernardino County, California, United States. The SELF is the largest expeditionary airfield (EAF) operated by the United States Marine Corps. It is also known as the Twentynine Palms EAF and is located at the Marine Corps Air Ground Combat Center (MCAGCC) Twentynine Palms.