I did this Manhattan mission with V1.02 of the game
I found only four enemy spy camps.(not 6)
Taking out the main base is a strange one. By this time I had completed the other sub missions and gone back to Manhattan main base and borrowed an APC rather than the Humvee for better hardness.
I ran around in the woods near the main base in APC, encountered and took out enemy infantry who fanned out from the base chasing me. I encountered 4 inactive abrams friendly tanks in the clearing (two of them had mountable operating machine guns) but no use to me. Are they boomerang? useless. I continued scouting with APC in woods near main base and eventually one of the dead infantry popped up an amber waypoint sign. I went to him and sign popped up, he was the commander.
For some strange reason (probably because commander was dead) the tank at base became inactive and when I ran around the base with the APC shooting everything there was little resistance and mission completed when all dead at base.
What was Boomerang in manhattan mission?
Also I do not know how to calla arty support in this mission.