Commander in Chief
The framers of the Constitution wanted to preserve civil authority over the military, and designated the president "Commander in Chief of the Army and Navy." During national crises and war, the power of the presidency has increased to include approval of military tactics, control of the economy, and authority to limit the civil rights of Americans at home.
This responsibility has grown dramatically from the time George Washington took up his sword during the Whiskey Rebellion to the day Harry S. Truman authorized dropping an atomic bomb on Japan. The burden of such awesome power rests heavily on every president.
As commander in chief, presidents have been able to implement social policies not otherwise available to them. A striking example of this was in 1948 when Harry S. Truman signed Executive Order 9981 desegregating the armed forces. The order stated "It is hereby declared to be the policy of the President that there shall be equality of treatment and opportunity for all persons in the armed services without regard to race, color, religion, or national origin."