https://www.war.gov/

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https://www.war.gov/News/News-Stories/Article/Article/4295826/trump-renames-dod-to-department-of-war/

Trump Renames DOD to Department of War

Sept. 5, 2025 | By Matthew Olay, Department of War 

Quote:

The War Department was originally established by Congress on Aug. 7, 1789, the same year the Constitution took effect. It replaced the Board of War and Ordnance, which was created in 1776 during the Revolutionary War.  

The War Department had oversight over the Army and Navy until 1798, when the Navy Department was formed.  

The first secretary of war, a civilian position, was retired Army Gen. Henry Knox, who was appointed by President George Washington. Fort Knox, Kentucky, is named after him.