A Military School?
Was this a good idea? Military obviously wasn't thought very favorably in '78,so it seems odd to have chosen this, other than to have the school appear corrupted and possessed. But that really wasn't how the movie played out, but it was to just visually appear that way.
Had this been made after the slasher films that were on the horizon, there would have been teenagers galore at a summer camp and Robert Foxworth and Lance Hendrickson would have been counselors.