Redeployment
Shoot, I was going to suggest that one. :(
Anyway, I'd like to remind everyone that you're not likely to encounter mobile SAM units, such as HAWK or Patriot, in their permanent peacetime facilities. Once a conflict starts, they will move to pre-determined locations in the surrounding area and likely switch between multiple locations on a near-daily basis. Systems with multiple fire units will not move all units at the same time, since one or more units are needed at operational status to provide cover during the redeployment.
Afterthought:
Redeployment to alternate sites also means that the placement of radars, command posts and launchers become more fluid, although they will still maintain the same basic structure - radars and launchers usually fan out to opposite sides of the command posts, with any specialized target tracking radars closest to the launcher clusters.