What is the proper AHA first aid response to diabetic attack?

First, the AHA doesn't deal with Diabetes. They deal with cardiac problems and are the ones that govern the CPR portion of your First Aid class.

Second, there is no such thing as a Diabetic Attack. There is Hypoglycemia and Hyperglycemia. In either case treatment should consist of a call to 911 and administration of some form of Glucose. We usually recommend they suck on a piece of hard candy if they have a patent airway and can swallow.