 Díaz Colón was promoted to Major General (Line) on November 18, 1993 and continued as Adjustant General until he retired from the Puerto Rico Army National Guard in 2001.In July 2011, Luis Fortuño, the Governor of Puerto Rico, named Díaz Colón for the position of Superintendent of the Puerto Rico Police Department.He thus became the first person who was a former Adjutant General of the Puerto Rico National Guard to be named to that position.