Yes, it was 5ID but a little before for me. I did two rotations in '86 and '87.
I want to add that while I'm sure things are a LOT different now with the MI units and Iraq/Afghanistan, I still wonder if the training is all that different. For instance the author's suggestion of Ranger school would be an excellent idea. Or do they consider a short course at the "Light" training center at Ft Polk now to be sufficient?