The Protectors are evacuating people and supplies from the fallen Laomedon Manufacturing facility.  You must prevent the aliens from launching more units against the facility and the evacuating craft.
I strongly suspect that there is another Gate in this area but I am uncertain of the exact site because of a regional dampening field.
You will be patrolling to the east of the Manufacturing facility.  Following your drop-off proceed south, I postulate that the Gate is located in an area of craters near Mount Laomedon.
If you find the Gate destroy it quickly as we are afraid of another attack against our people.