Are you the mom or the dad (having done a tour in Iraq)?
I've been a lot of places, the Arabian Gulf included. And aboard ship there is even less opporunity to call home than there is ashore. We sometimes go months without even the chance to call, 3 and 4 weeks between calls is normal.
If your times are off and you can't reach them, you leave a message, tell them you love them, and let them know when you expect to call next.
There are a LOT of things that are difficult about deploying, but they do not constitute grounds, IMLTHO, for breaking rules that are in place for good reason. I believe the 'no cell phones during school hours' rules are good rules, and therefore would not endeavor to ask them to be broken or bent because I am in some way 'special'.
I'm not sympathetic to this case and do not consider justifying poor behavior on the part of this boy as supporting the troops in any way.