The bureaus are the Bureau of Navigation, whose Chief has the rank of Rear Admiral, and which has charge of the issuing and enforcing of orders to officers and enlisted men and the keeping of the records; the Bureau of Ordnance, whose Chief has the rank of Rear Admiral, and which has charge of the design, manufacture and repair of guns, torpedoes and ammunition; the Bureau of Construction and Repair, whose head is the Chief Constructor of the Navy and has the rank of Rear Admiral, and which has charge of the designing, construction and repair of all of the vessels of the Navy; the Bureau of Steam Engineering, whose head is the Engineer in Chief of the Navy, with the rank of Rear Admiral, and which has charge of the designing, construction and repair of the engines and boilers in the ships of the Navy; a Bureau of Supplies and Accounts, whose head is the Paymaster General of the Navy, with the rank of Rear Admiral, and which has charge of the purchase and issue of supplies and provisions for the Navy and the paying of the officers and enlisted men; the Bureau of Medicine and Surgery, whose head is the Surgeon General of the Navy, with the rank of Rear Admiral, and which has charge of the hospitals ashore, the hospital ships, and the health and sanitation of the Navy both afloat and ashore; the Bureau of Yards and Docks, whose Chief has the rank of Rear Admiral, and which has charge of the designing and construction and repair of the buildings and docks at the shore establishments of the Navy; and the Office of the Judge Advocate General, whose head is the Judge Advocate General of the Navy with the rank of Captain, and which has charge of the courts-martial and legal affairs of the Navy.

For purposes of command and organization afloat and ashore the officers of the Navy are divided into the “Line,” composed of the officers holding the military command in the various ranks, and of a number of “Staff Corps,” composed of officers who have charge of the various coordinate duties.

These “Staff Corps” are the Medical Corps, the Pay Corps, the Chaplains, the Corps of Naval Constructors, the Corps of Civil Engineers and the Professors of Mathematics. Prior to 1899 there was also a separate Corps of Engineers, but in that year this corps was consolidated with the Line and since that time the only officers holding the ranks of Chief Engineer, Passed Assistant Engineer and Assistant Engineer in the Navy are officers of the old Engineer Corps who are now carried on the Retired List of Officers.

The Marine Corps.—The Marine Corps is a distinct military organization normally forming an integral part of the Navy, but when the President so orders any portion of the corps may be detached for service with the Army, and in every war in which the United States has been engaged the marines have fought as a part of the crews of the fighting ships of the Navy, as landing forces and expeditionary forces with the Navy and also on detached service with the Army.

The Marine Corps is commanded by a Major General Commandant whose station is at Headquarters of the Corps in Washington, and who is assisted by a staff consisting of an Adjutant and Inspector’s Department, a Quartermaster’s Department and a Paymaster’s Department, each headed by a Brigadier General.

The officers of the Adjutant and Inspector’s Department perform the duties that are performed in the Army by the Departments of the Adjutant General and the Inspector General; the Quartermaster’s Department has charge of the supplies, provisions, transportation and the construction and maintenance of barracks and buildings; and the Paymaster’s Department has charge of the accounts and pay of the officers and enlisted men of the Corps.

Detachments of the marines are stationed at all of the Navy Yards and Naval Stations of the United States both at home and abroad, and they also serve as Legation Guards for American Legations in countries where such guards are considered necessary, as expeditionary forces with the Fleet and for the protection of Americans and their rights in foreign countries during revolutions and disorders, on detached duty with the Army as circumstances require in time of war, and aboard the battleships and cruisers of the Navy as a part of the crew, their special duties aboard ship being as crews for the Torpedo Defense batteries of guns of intermediate caliber and rapid-fire guns.

The Marines of a Fleet are organized into a regiment for duty as a landing force, the detachment from each ship forming one of the companies, and the Colonel commanding the regiment serves on the Staff of the Admiral in command of the Fleet.

When assigned to shore duty the Marines are organized into permanent companies, these companies being combined into provisional battalions, regiments and brigades according to the service or duty required.

The Marine Detachment or company serving on board a ship of the Navy is paraded as the guard of honor when such a guard is turned out to receive the President, the ruler of any foreign country, or any lesser officer or official entitled to such honors.