A Director of Medical Services, an Intendant-General, and a Judge-Advocate-General are attached to “General,” as well as to “Army,” Head-Quarters. As regards the other Services, the _Veterinary_ and _Postal Services_, and the _Chaplains_, do not generally form part of any higher Staffs than those of Divisions. It will be seen that the system is so designed that in the main the business of Administration in detail falls on the Divisional and Army Corps Commands, while the Army Command is left free to concentrate its attention on the enemy. The principles on which the Administration of an Army in the Field is organized for war as carried on at the present day, can be best understood by a study of the British Administrative Services. The general lines of their organization will be found described in Chapters IX. and X. CHAPTER VI THE STAFF HEAD-QUARTERS Each of the various formations of Troops just described is completed by appointing its Commander and providing him with a _Staff_--that is, a body of Staff Officers to assist him in the duties of Command. The Commander and his Staff form what is known as the _Head-Quarters_ of every Command. Those of the Commander-in-Chief are termed _General Head-Quarters_, those of an Army Commander _Army Head-Quarters_, and so on, down to _Brigade Head-Quarters_. COMPOSITION OF HEAD-QUARTERS Head-Quarters consist essentially of the _Commander_ with his _Personal Staff_, and of the Staff Officers constituting the _Staff_ proper, which it is the object of this chapter to describe in detail. The Personal Staff needs little remark. It comprises the officers acting as _Aides de Camp_ to the Commander, and in important Head-Quarters there is also a _Military Secretary_. These officers act as confidential secretaries to their Chief, carry his Orders, manage his household, and arrange for its movements. Their relations with their Chief are more personal than official, and they are not considered to be Staff Officers. Besides the Staff, there are generally attached to Head-Quarters a number of other Officers, such as those of Administrative Services, and in some armies Officers of Artillery or Engineers. But these cannot be properly called Staff Officers, as they have only a limited sphere of action in the Command, while they perform definite executive and administrative functions in their own sphere. The action of _Staff Officers_, on the contrary, ranges over the whole Command, but they have no personal responsibility or executive functions. In fact they are useful appendages to each link of the chain of Command, but not actually links in it themselves.