Presidents by principal profession.
Some had more than one occupation.
Academic
Woodrow Wilson
Actor
Ronald Reagan
Businessman
George Bush
Farmer
Jimmy Carter
Harry S Truman
George Washington
Lawyer
John Adams
John Quincy Adams
Chester Arthur
James Buchanan
Grover Cleveland
Bill Clinton
Calvin Coolidge
Millard Fillmore
Gerald Ford
James Garfield
Benjamin Harrison
Rutherford B Hayes
Andrew Jackson
Thomas Jefferson
Abraham Lincoln
William McKinley
James Monroe
Richard Nixon
Franklin Pierce
James Polk
Franklin D Roosevelt
William H Taft
John Tyler
Martin Van Buren
Haberdasher
Harry S Truman
Military
Dwight D Eisenhower
Ulysses S Grant
William H Harrison
Zachary Taylor
George Washington
Mining Engineer
Herbert Hoover
Newspaper Publisher
Warren G Harding
Tailor
Andrew Johnson
Teacher
Lyndon B Johnson
Writer
John F Kennedy

Presidents by War Service.
American Revolution
Andrew Jackson
James Madison
James Monroe
George Washington
War of 1812
William Henry Harrison
Andrew Jackson
Zachary Taylor
John Tyler
Mexican-American
Millard Fillmore
Ulysses S Grant
Franklin Pierce
Zachary Taylor
Civil War
Chester A Arthur
James Garfield
Ulysses S Grant
Benjamin Harrison
Rutherford B Hayes
Andrew Johnson
William McKinley
Spanish-American
Theodore Roosevelt
World War I
Dwight D Eisenhower
Harry S Truman
World War II
George H.W. Bush
Dwight D Eisenhower
Gerald R Ford
Lyndon B Johnson
John F Kennedy
Richard M Nixon
Ronald Reagan
Korean War
None
Vietnam War
None

Presidents by highest military rank.
General of the Armies ****** (six stars)
George Washington (1)
General of the Army ***** (5 stars)
Dwight D Eisenhower
Ulysses S Grant
Lt General *** (3 stars)
George Washington (1)
Major General ** (2 stars)
James Garfield
William Henry Harrison
Rutherford B Hayes
Andrew Jackson
Zachary Taylor
Brig General * (1 star)
Benjamin Harrison
Andrew Johnson (2)
Franklin Pierce
Colonel
James Madison (3)
Theodore Roosevelt
Lt Colonel
James Monroe (3)
Major / Lt Cmdr (Navy)
Gerald Ford (Navy)
Lyndon B Johnson (Navy)
William McKinley
Richard Nixon (Navy)
Harry S Truman
Captain / Lt (Navy)
Jimmy Carter (Navy)
Abraham Lincoln (3)
Ronald Reagan
John Tyler (3)
1st Lt / Lt jg (Navy)
George H.W. Bush (41) (Navy)
John F Kennedy (Navy)
George W. Bush (41) (Air NG)
(1) Posthumously promoted to 6-star General of the Armies by Congress in 1976. John J. Pershing is the only other U.S. General to have six stars.
(2) As military governor of Tennessee.
(3) Militia.