Commander-in-chief
From Tardis Wiki, the free Doctor Who reference
After the Eleventh Doctor was caught by NASA security for breaking into Apollo 11, Richard Nixon ordered his released using his authority as commander-in-chief of NASA and its employees Grant and Gardner. (TV: Day of the Moon)
Kate Stewart noted that, as President of Earth, the Twelfth Doctor was the commander-in-chief of every army on Earth. (TV: Death in Heaven)
