The Ancient and Honorable Artillery Company of Massachusetts is the oldest chartered military organization in North America and the third oldest chartered military organization in the world. A volunteer militia of the Commonwealth of Massachusetts, it is not part of the U.S. Armed Forces, but includes veterans and serving military members within its ranks. Prior to 1913, the Company served as the de facto officer school for the Massachusetts Militia. Since 1746, the headquarters of the company has been located in Faneuil Hall. In this armory, the company maintains a military museum with free admission and library containing relics from every war the United States has fought since its settlement. The armory is open to the public daily. Governor Winthrop granted a charter on March 13, 1638, and on the first Monday in June following, an election of officers was held on Boston Common. The original name of the company was "The Military Company of Massachusetts". It began to be referred to as "The Ancient and Honorable Artillery Company" in the year 1737.