^In Addition:
If I was the bad-guy:
Send in the small helos in three waves, low/medium and High. Low/medium to slaughter as many blue-dudes as possible on the GROUND. The high group waits for the blue-guys on "dragons" to drop on the lower force, and then hits them from above.
The shuttle is FAST, remember it's fast enough to get to orbit. Send it in higher than the dragons can fly, drop the daisy-cutter from high altitude. They have computers, and they have the lower-groups for air-density and wind measurements to make the drop accurate enough to hit the tree-area. Pull back the smaller helos at drop, pulling the dragons back from the target area with them so there's no chance to get the "package" (I assume it's a parachute bomb like the "real life" equivalent).
For the ground-pounders, drop them and have them hold up in a "box", if the natives are stupid enough to charge, let them. Once the daisy-cutter drops and detonates, then advance over the shattered forest while the natives are stunned and kill as many as necessary. Since I looked like they were concentrating around the tree, most will be dead or injured. Pull back after 1/2 hour (remember, the objective was to "Blast a hole in their racial memories so big they won't come within a 1000 clicks of our operation", not genocide) before the natives can regroup, and fly home.
Marine casualties: close to 0.
One of the first rules of strategy: fight YOUR fight, not your enemies.