go on graduation day.....the doors are unlocked!
however, they do have camaras......so you wont wander too long...and if they see you while they are outside "smokign" the children, take video as quick as possible, because as soon as they spot you, they will round up the kids and take them inside.
I saw this happen with my own eyes when I went to rescue my son....shocked the drill instructor whe he turned and saw us standing on the other side of the fence..but at last he stopped smoking the poor boy, he looked like he was about to pass about....and everytime the kid went down to teh ground to do his exercise, the instructor stuck his foot in his back!