This image shows the details of the underground silo used at the California Helendale facility. The Helendale RCS facility is owned and operated by Lockheed-Martin.
These are photos of an elliptical aircraft mounted on a stinger (a pylon) at the Lockheed Skunkworks RCS facility at Helendale in Southern California.
This is an aerial view of the Northrop Phantom Works RCS facility on the Tejon Ranch property in the Tehachapis. This is the site of an underground facility we have dubbed the "anthill". The Tejon ranch also has an identical silo and pylon affair.