[4] The UN School (FN-skolan) was located at the regiment from 1956 to 1984, when it was relocated to Almnäs Garrison.

In 1994, the Södermanland Brigade was separated from the regiment and from 1 July of the same year became a cadre-organized war unit within the Middle Military District (Milo M).

In connection with the OLLI reform (OLLI-reformen) on 1 July 1973, Strängnäs Defence District was given joint staff with the Södermanland Regiment.

On 28 May 1970, the school was separated from the Södermanland Regiment, and formed an independent unit and authority.

In the summer of 1991, the school was relocated to Skövde, where, from 1 July 1991, it was amalgamated into the newly formed Swedish Army Maintenance Center (Arméns underhållscentrum, UhC).

The colour is drawn by Bengt Olof Kälde and embroidered by machine in insertion technique by the company Libraria.

Blazon: "On yellow cloth the provincial badge of Södermanland; a black griffon segreant, armed and langued red.

On a black border at the upper side of the colour, battle honours in yellow.

Blazon: "Or, the provincial badge of Södermanland, a griffin segreant, sable, armed and langued gules.

The shield surmounted two arms in fess, embowed and vambraced, the hands holding swords in saltire, or".

Blazon: "Or, the provincial badge of Södermanland, a griffin segreant sable, armed and langued gules.

The medal ribbon is of yellow moiré with three evenly divided black stripes.