Omar Efraín Torrijos Herrera (February 13, 1929 – July 31, 1981) was a Panamanian military officer, politician, and revolutionary who was the military leader of Panama, as well as the Commander of the Panamanian National Guard from 1968 to his death in 1981. Torrijos was never officially the president of Panama, but instead held self-imposed and all-encompassing titles including "Maximum Leader of the Panamanian Revolution". Torrijos took power in a coup d'état and instituted a number of social reforms. Torrijos is best known for negotiating the 1977 Torrijos–Carter Treaties that eventually gave Panama full sovereignty over the Panama Canal. The two treaties guaranteed that Panama would gain control of the Panama Canal after 1999, ending the control of the canal that the U.S. had exercised since 1903. On December 31, 1999, the final phase of the treaty, the US relinquished control of the Panama Canal and all areas in what had been the Panama Canal Zone. His son Martín Torrijos was president from 2004 to 2009.