Now that the enemy forces are moving to re-establish the communications post, the coast is clear for your launch against the military base.

In spite of the movement of the majority of Alien units to the site of the destroyed communications post, there are still a large number of units near the military depot.  There is a serious risk in attempting the next mission.  You are still able to launch against the convoy, before the Alien reinforcements arrive to fortify its guard, if you feel you are not up to assaulting the base.~