The 213th Air Defense Artillery is a regiment in the Pennsylvania Army National Guard. The regiment appears to have been established as an Air Defense Artillery Branch unit in 1989-90, according to The Institute of Heraldry insignia data. The Reading Eagle of August 31, 1989, advertised for personnel to join Battery B of the 1st Battalion, a 'new Army National Guard unit'. By October 1, 1997, it was part of the 28th Infantry Division.