The California portion of the desert also contains Edwards Air Force Base and Naval Air Weapons Station China Lake, noted for experimental aviation and weapons projects, and the largest Marine Corps base in the world at Twentynine Palms. The US Army also maintains Fort Irwin & the National Training Center (NTC) which is another major training area for the United States military. Mojave airport is also home to a long-term storage facility for large airplanes due to extremely dry non-corrosive weather conditions and a hard ground ideal for parking aircraft. The airport also houses the Air and Space Port and was one of the test centers for the Virgin Galactic Fleet.