I read this quote today on an email list of which I am a member and have received permission to post it here. The subject at hand was ex-army officers who currently teach.
I think we teach because we've been taught to care about people. The Navy has their boats, the Air Force has their planes. What do we have? People. Growing kids by teaching them is just a continuation of that attitude.
This was in no way a slam against our brethren in other services. It's merely a matter of emphasis.