Mystery Military Event

My dad and I found this photo along with a bunch of photos stashed in a box from my grandfather. There are 4 pictures total with this event. I have no idea what exactly is going on except that it looks like some kind of military event. The picture looks like it was taken in a high school gym. Perhaps its a ROTC event or a welcome back the troop event. There's no writing on any of these 4 photos except the May 65 imprint on the side of the photo perhaps when they were processed or taken