Dwight D. Eisenhower was the last former general to become president.
Eisenhower
The first one was Grant. But there were also Garfield, Benjamin Harrison and McKinley.
He was a General in the U.S. Army during the American Civil War. Later after Lincoln and Johnson he was elected for two terms as President.
The US has never had a governor general. The first President of the United States was George Washington. The first US Governor-General of the Philippines was William Howard Taft.
George Washington
John Adams, America's first Vice President under Washington became the second US President.
Dwight Eisenhover
General Sherman remained in the army after the US Civil War. In March of 1869, President US Grant promoted Sherman to the US general in chief.
James Madison
1789
Dwight David Eisenhower