Either way, the controller does not have enough information to use a heading — neither to know one is needed nor what it should be .
I have never flown in the United States so am not sure, but if this was Australia the controller couldn’t give the helicopter a vector while it is below the minimum vectoring altitude anyway. I would be surprised if the controller in DC was able to legally issue a heading instruction to the Blackhawk while it is at or below 200ft at night. Can one of the American readers correct me if I am wrong?
Thanks