What's more, the judgement of school administrators has been replaced over the past decade (at least, maybe more) with "zero tolerance" policies. Had administration used any reasonable judgement, they'd have ascertained the situation ("kid talking to his mom half a world away in a theater of war), taken the kid to the school office, and told him "Talk to your mom here". As it is, they probably didn't have the opportunity to exercise any judgement because the school has a "zero tolerance" rule for phone calls.
BTW, some phone company (Nextel, I think), set up a phone network in Iraq very early on and arranged things so servicemen had free and easy access to calls back to the US...making calls out still isn't a picnic, but it's not as difficult as it usually is, as you related in an earlier post.