There is a slight question of geography and distance involved here.
Mojave is East of LA and near Lancaster, CA.
Davis Monthan, the military graveyard, is near Tucson as is Marrana. Mojave is a long days drive too and from Las Vegas.
If you are going to Las Vegas the nearest storage area is right on McCarran Field in Las Vegas but there is another at Kingman which is South on Rt93/95.
As you seem to be from the UK beware of the distances involved it is a big country.