Phantom Regiment 1981 DATR. If you recall, DCI attempted to stage two back to back shows in various cities in order to cut expenses.
These pics were taken during the Friday night show. Notice there is only a 50 yard line marked off? The corps complained and the field was lined every 5 yards by the Saturday evening show. This may have been the decision of the stadium management because at the time, AAA baseball was being played there...