Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Panama Canal Division was a unit of the United States Army, established in order to ensure the United States could adequately defend the Canal Zone in Panama. When it was authorized in 1920, similar divisions were organized to defend Hawaii and the Philippines.
History
The Panama Canal Division was organized in 1921, and was active until 1932. Its initial composition included the 19th Infantry Brigade commanding the (14th and 65th Infantry Regiments, of which the 65th was stationed in Puerto Rico) and the 20th Infantry Brigade commanding the (33rd and 42nd Infantry Regiments). The two brigades appear to have been active until 1927.
The commander of the Panama Canal Department, Major General Preston Brown, later determined that the defense of Panama would be better served by command groups representing the Atlantic and the Pacific. In 1932, the Army inactivated the division, keeping its Tables of Organization on file should the need arise to reactivate it. It never has.