Part of your initial goal in setting up your
base should be to create several defensive units. Whether this means
a collection of deployed GIs or Flak Troopers acting as temporary
air defense, your defensive force should be the first thing you
Units are preferable to defensive structures for one very important
reason: they're mobile. You can't uproot Prism Towers and ship them
to the other side of your base to defend against incoming Rhino
Tanks. You can move your own Grizzlies to react to a threat.
As with setting up attacking groups, make sure that you plan for
every possible contingency. Create units that can defend against air
attacks, infantry, and vehicles.