"so simple grade schoolers could do it'
I love how you just blew that whole formation off.
It's one of the largest, most fantastic, formations yet. Infrared cameras were trained on that field all night and there were NO flashlights or other light sources seen or captured on film. This formation covers two and a half acres.
There is no way this could have been done by a dorm full of drunken college students in the 90 minute period it went down without leaving a trace. it was pristeen.
Certainly afterwards, there would be no "military exercises".
Absolutely NO reason for that either.
They usually don't send out the military for pranks.