Hi David @bigwave, you shouldn’t be too worried about your son “surviving” band camp - he will do well as long as he is aware of how he is feeling and knowing symptoms. Most especially HIS feelings when his BGL is dropping. A little extra bit of foresight on his part and on yours - be proactive - will go a long way. When more active and eating “differently”, monitor frequently and stay hydrated - everyone at camp should stay well hydrated. Low BG and dehydration symptoms are similar, but a low BG can falsely read high on a BG meter.
You don’t mention his insulin therapy protocol; if he uses a pump, he may want to set a temporary basal rate lower than 100% on marching days. He should always have something like a chocolate-nut granola bar with him. Diabetes should NOT keep him from being a teen boy and being a full participant in activities.
Two weeks after being released from hospital following my diagnosis, I was working on a highway labor crew - so what, I lied and added two years to my age to get the job. And that was 35 years before the invention of “home” blood sugar testing. Dave, let him be and don’t be over-protective but do keep a watchful eye on him from the distance and be ready to step in.