How many U.S. Presidents have served in the military?
Twenty-six U.S. Presidents have served in various branches of the military.
 George Washington
 Thomas Jefferson
 James Madison
 James Monroe
 Andrew Jackson
 William Henry Harrison
 John Tyler
 James K. Polk
 Zachary Taylor
 Millard Fillmore
 Franklin Pierce
 James Buchanan
 Abraham Lincoln
 Andrew Johnson
 Ulysses S. Grant
 Rutherford B. Hayes
 James A. Garfield
 Chester A. Arthur
 Benjamin Harrison
 William McKinley
 Theodore Roosevelt
 Harry S. Truman
 Dwight D. Eisenhower
 John F. Kennedy
 Lyndon B. Johnson
 Richard M. Nixon
 Gerald R. Ford, Jr.
 Jimmy Carter
 Ronald Reagan
 George Bush
 George W. Bush