LeQ it isn't that a woman chooses her service husband over her children. For service children (who are only a minor(?) part of the boarding population) they are quite likely to move
a) at short notice and therefore not be able to apply with everyone else to what would be the school of choice
b) to whereever the service person is sent and have to make the best job of whatever school is available and what the logistics of the family allow (often the service person is 'unreliable' for childcare arrangements due to work commitments)
c)not just between schools but between school systems eg Scottish/English as well as other nations with international postings.
d) during exam cycles. Of course what might be a good time for a move for one child wouldn't necessarily be so for a sibling.
LeQ, the deal for forces families is that they get the CEA money because the family home moves, so the wife has to go with the husband and cannot stay near the children. 
On the other hand the wife could stay with the children in one location and DH commute when and if he could. For us, post children if I had stayed in one place with the children in an area with decent schools for them, I would have lived with DH for 3 years. We have teenage kids and have been married since before we had them.
I have no idea if you are in a relationship but imagine if you will, being separated from your partner for 80% of your marriage while you stayed with your kids. 80% of the last however many years. Could you do it? With a strong marriage still? Having lived apart for some years i don't think I could.
So, we knew all this when he joined/we married right? No. The cuts in defence in the intervening years have meant the services are more stretched and life has become more unpredictable and liable, for us, to many more moves that we had invisaged before children.
So he could leave. As with many walks of life he has progressed th career ladder and recieved an increased income in return. Hurrah! But like many othrs we have grown into our income. This means it would be difficult to change our family's lifestyle. Although not expensive by any means, in fact due to it's location it's way under what 'Phil and Kirsty' get to spend, my daughter adores our house, she would be distraught for us to sell it. we can't afford it without his salary.
So move to civvy street doing what he does. There is no comparative job there, his salary would plummet.
My children are HAPPY to board and were involved in the choice of school. They are having a good education and know it and enjoy it. I have a warm, close and loving relationship with my children (and my parents FWIW).
Many on this thread are regulars and KNOW just how important the education of their children is to mums. For SOME service families boarding is the best solution to a tricky problem.Teenagers and the services is HARD whatever the answer. You may not be able to imagine doing it but please allow that for SOME families it is the best choice available and not slag 'em off for the difficult choice they've had to make!!
i suspect I've taken soooo long to write all that that I'll be way behind the thread!