[2] Södertörn Marine Regiment was raised in 1956 as the 3rd Coastal Artillery Brigade (Tredje kustartilleribrigaden, KAB 3).

The brigade consisted initially in the war organization of a staff at Järflotta and three barrier battalions (spärrbataljoner), Ornö, Mellsten, and Askö.

[4] The Södertörn Group (Södertörnsgruppen) was raised on 1 July 1994 as the Södertörn Marine Brigade (SMB), along with Roslagen Marine Brigade (RMB), and as a result of that the East Coast Naval Command (MKO) was formed in 1990.

Blazon: "Per pale or the provincial badge of Södermanland, a griffon segreant sableand azure an anchor surmounted two gunbarrels of older pattern in saltire, all or".

[7] In 2017 (or 2018), the traditions were transferred to the Södertörn Group, this after the decision that the Home Guard battalions should bear the insignia of the 1st Marine Regiment (Amf 1) as a unit insignia.