I count six : Martin Van Buren, John Tyler, Andrew Johnson, Harry Truman, Lyndon Johnson and Richard Nixon .
10 presidents served both as US representatives and as senators. They were: John Quincy Adams, Andrew Jackson, William Henry Harrison, John Tyler, Franklin Pierce, James Buchanan, Andrew Johnson, John F. Kennedy, Lyndon B. Johnson , and Richard M. Nixon .
There were 25 US presidents who never served in the Senate.
Nixon, Kennedy, Lyndon Johnson and Obama were Senators. Nixon, Kennedy, Lyndon Johnson, Ford and George H.W. Bush all served terms in the House.
14 presidents served as vice president before becoming president
According to the Senate website, in the current congress, there are 26 senators who served in the military. These include senators who served in Korea, Vietnam, Kosovo, Iraq, and Afghanistan.
3
Zero. Many Presidents served in the military, but none were in ROTC.
No because they have too many things in common
Actually many future Presidents were commanded by Presidents. Example: JF Kennedy served in the Navy under Roosevelt and Trueman (Who served in the Army under Wilson). LB Johnson served in the Navy under FDR, George HW Bush served in the Navy under FDR & Trueman. Many of the Presidents served in the military and took orders from the Presidents in office.
42
no one knows
1