Actually the on near Tucson is not the biggest one. It's located at Marana Pinal Airpark. The biggest one is at Victorville California. You can also check Mojave Spaceport in California, Kingman, Arizona - Goodyear, Arizona - Greenwood, Mississippi - Opa Locka, Florida, Maxton, North Carolina or 20 other graveyards in US. They also have one in France and one in UK.