I believe it was the department of war. Or Department of the Navy. Both made up in the late 1790s when he was President.
The Department of Defense is in charge of the U.S. military.
Many felt that the name, Department of War, was too aggresive. It was one of the four original departments in Washington's first cabinet. The name was changed when the National Security Act was passed in 1947 which combined the Department of War and the Department of the Navy, and it was called the National Military Establishment. An act to amend the NSA was passed by Congress in 1949 and the name was changed to Department of Defense. Under the act, the Secretary of Defense was created, appointed by the President with consent of the Senate. The Secretary supervises the entire military.
The Executive Department of the United States consists of the President and all those who report to him. This includes the Vice-President, all Cabinet Secretaries, all employees of Cabinet Departments, and all employees of the Office of the President and the Office of the Vice-President. An Executive Department Official is any official of any of these Departments, including the President and Vice-President themselves.
Brigham Young, president of the Church of Jesus Christ of Latter Day Saints (commonly called "Mormons") created the first department store in the United States, called Zions Cooperative Mercantile Institution (or ZCMI) in Salt Lake City, Utah in 1868.
I am not sure what "specialized" means here. The President get advice from his cabinet, from the White House staff and the joint chiefs for military advice. Many of them have special skills and knowledge. Some of them were picked for their service to the President's election campaign .
The head of a federal executive department is usually called "Secretary", except that the head of the Justice Department is the Attorney General.
There were three cabinet departments that were created by the First Congress. These departments included the Department of War, the Department of Treasury, and the Department of State. These departments were created in 1789.
After Union General William Rosencrans was defeated at the US Civil War Battle of Chickamauga, President Lincoln had lost all confidence in General Rosencrans. As a result of this Lincoln combined the departments of generals Burnside and Rosencrans with US Grants. The new military department of the Mississippi was now under the command of US Grant.
Cabinet Secretaries
President bush
This group is called the president's cabinet.
This group is called the president's cabinet.