Milo NN was created in 1966 along with five other military districts as part of a reorganisation of the administrative divisions of the Swedish Armed Forces. It can be seen as the successor of II Military District (II. militärområdet) created in 1942, but that did not have the same tasks as Milo NN. The military district consisted of the land covered by the above-mentioned counties, and from 1982, also the southern part of Gävleborg County. In 1993, the number of military districts of Sweden was decreased to three, and as a consequence of that, Milo NN was merged with the Upper Norrland Military District (Milo ÖN) to create a new military district, the Northern Military District (Milo N).
Fortress Battalion Hemsön covering the Hemsön Naval Base near Härnösand, with three twin 152mm m/51 coastal artillery guns, and two 75mm Tornpjäs m/57 batteries on Hemsön and Härnön islands
Fortress Battalion Gävle, with a battery of four 152mm m/98 turreted cannons and two batteries of three 75mm m/05-10 coastal canons each
Fortress Battalion Sundsvall, with a battery of three 152mm m/98 turreted cannons, two batteries of three 75mm m/05-10 coastal canons each, and one 75mm Tornpjäs m/57 battery in Nyhamn
Fortress Battalion Luleå, with a battery of three 152mm m/98 turreted cannons and a battery of three of 57mm m/89 rapid fire guns
HSwMS Alnösund (14) minelayer
In wartime the Lower Norrland Military District would have activated the following major land units, as well as a host of smaller units:
12th Division, in Östersund
IB 14 - Gästrikeleden Brigade, in Gävle, a Type 77 infantry brigade based on the I 14 - Hälsingland Regiment
IB 21 - Ådal Brigade, in Sollefteå, a Type 66M infantry brigade based on the I 21 - Västernorrland Regiment
NB 35 - Field Jäger Brigade, in Östersund, a Type 85 Norrland Brigade (optimized for arctic/winter warfare) based on the I 5 - Jämtland Ranger Regiment
IB 44 - Hälsinge Brigade, in Gävle, a Type 66M infantry brigade based on the I 14 - Hälsingland Regiment
NB 51 - Ångermanland Brigade, in Sollefteå, a Type 85 Norrland Brigade based on the I 21 - Västernorrland Regiment
The coat of arms of the Lower Norrland Military District Staff 1983–1993. Blazon: "Azur, an erect sword with the area letter (NN - Lower Norrland) surrounded by an open chaplet of oak leaves, all or."[1]
^Lieutenant general Lars-Erik Wahlgren had an appointment of two years (1992–1994)[2] but never took up the post. Milo NN was then disbanded in 1993. In 1992, instead, the Chief of Staff, senior colonel Lars-Olof Strandberg became the last military commander.[3]
Westerberg, Lennart (1993). Militär ledning i nedre Norrland: minnesskrift med anledning av Milo NN upphörande 1993 (in Swedish). Östersund: Nedre Norrlands militärområde. SELIBR1698050.