Given that the highest rank possible in the US Military is Commander-in-Chief, and that the Commander-in-Chief is the President, they all held the highest rank possible.
THE ABOVE answer I found here is incorrect. The Commander-in-Chief position is civilian, not military. The whole point of making the president C-in-C is to have civilian control of the military, unlike in other countries in the 18th century whose military did not answer to the government. The president is not a member of the military. I am told George Washington was the only six star general in history (before being president, of course), but I have not checked.
George Washington, Andrew Jackson, William Henry Harrison, Zachary Taylor, Ulysses S. Grant, Rutherford B. Hayes, and Dwight D. Eisenhower all attained the rank of general before becoming President of the US. Other US presidents held lesser military ranks.
George Washington's highest military rank was commander in chief of the Continental Army.
How many presidents had no military service at the time of their election?
The Chief of Staff
The President of the United States is the Commander in Chief of the US military according to the Constitution. Since the president has no military rank, a special title was created for the position.
Commander-in-chief commander in chief of the armed forces.
German Shepard and the Belgian Malanois have the highest rank in the military.
Field Marshal is the highest military rank in Pakistan Army.
George Washington's highest military rank was commander in chief of the Continental Army.
German Shepard and the Belgian Malanois have the highest rank in the military.
The President is the Commander in Chief. Highest Rank of the Military.
Marshall.
Andrew Jackson held the highest military rank of Major General in the United States Army.
Colonel
General- is the highest rank
sergeant
General( 1-5{highest} stars)
Eagle