Hey Frederf. I hadn't actually looked at the briefing until just now, and you're right. We are to seek out enemy ground units in the area and destroy them. They should be a tank force moving along a road. I assumed it was an airfield strike, since the road they will be moving along is just to the north of an enemy airfield, and I hadn't looked at the briefing or zoomed in on the map until just now.
I see, from the link that Triple provided that OCA stands for Offensive Counter Air, or the destruction of enemy air assets and capabilities, such as airfields. I apologize for all the acronym questions... I know it's trivial, but it's a mix of curiosity and knowing for realism's sake. Thanks again!!