National Guard presence in high schools?

I just came home from work yesterday to find a National Guard t-shirt in my son’s laundry basket. I asked him where he got it. He said that reps from the MT National Guard came to the school and worked out with them in PE. They had a tug of war competition, my son’s team won and were given t-shirts for their victory. The t-shirts say “ National Guard” on the front and have a colorful stylized logo on the back that says “Warrior Fit”. Please don’t misunderstand me. I am not anti-military but my son is just 14 years old and just trying to find his way in the world. Now he’s got a cool new shirt from the NG that he and his friends will be wearing/advertising for the NG. I asked my son if we could put it in the donation box we always have going and he resisted that. The NG visit to school seems benign on the surface but it seems to me that this is how the military might start to hook kids. Am I overreacting? My husband says I am. This isn’t sitting well with me.