The National Sign Standards Program MCX is authorized by its inclusion on the Corps Mandatory Centers of Expertise Website. The MCX Charter spells out the responsibilities of the MCX and the services it provides.
The St. Paul District was originally the home of two MCXs relating to Corps signs. One of these was responsible for the sign standards program in general. The other provided engineering expertise on the construction and installation of waterway signs. The Initial Approval Request Report to combine the two MCXs was sent to HQUSACE in 1999.