Vandenberg Space Launch Complex 4 (SLC-4E) is used for payloads to polar orbits. The Vandenberg site can launch both Falcon 9 and Falcon Heavy,[18] but cannot launch to low inclination orbits. The neighboring SLC-4W has been converted to Landing Zone 4, where SpaceX has successfully landed three Falcon 9 first-stage boosters, the first in October 2018.[19]