Twentynine Palms Strategic Expeditionary Landing Field (ICAO: KNXP) is a military airfield located at Marine Corps Air Ground Combat Center (MCAGCC) Twentynine Palms in San Bernardino County, California. It serves as a key aviation asset for the largest Marine Corps base in the world, supporting training, expeditionary, and combat operations. The airfield is primarily used for military operations including rotary-wing and fixed-wing aircraft training exercises. It is not open to commercial aviation and does not serve civilian passengers. The facility supports the extensive training missions conducted across the vast desert ranges of MCAGCC.