Topsy Turvey.
Thank you very much for your post. You have proved my point for me. All of the functions that you mention are vital.
All are essential.
All can be done by mil personnel with minimal training. They will do everything the CS do. In addition they can fight, deploy, provide Mil Aid to Civ Community etc. CS are 1/2 a mil man. At best. When terrosrists break through the gate and are charging up the stairs, which of your office managers will be cowering under desks, and which will be reaching for the L85 and slamming home a magazine.
It is called the ministry of defence. Not the ministry of Administration.
The mil can do the CS's job. The CS cannot do the Mil's job.
You may find this unpalatable. But it does not make it any less true.