andrew tilghman, you talked about this earlier. in 1973, officers had an average age of 32 years old, now 34.5. but unless man has risen from an average age of 25 up to 27. of and there are longer serving. officer average years haven't risen from 9.7 up until 10. what are the pluses and minuses? guest: it is more expensive to have a longer serving force, people reaching higher pay grades, people with higher levels of education and training cost more. host: is a recruiting expensive? guest: where the expense really comes in is behind those numbers, more people reaching retirement than they used to. military retirement benefits are extremely generous. that is something the pentagon is wrestling with. if that system will be able to continue in this age of austerity. host: michigan, james, active- duty, good morning. what is your story? caller: i actually have two questions for your guest. one is regarding civilian control over the military, one of the underlying tenants of society. how many presidents, vice presidents, secretaries of