 The military area consisted of the land covered by the above-mentioned counties, and from the creation to 1982, also the southern part of Gävleborg County.In 1991, the number of military districts of Sweden was decreased to five, and as a consequence of that, Milo Ö was merged with Bergslagen Military District (Milo B) to create a new military district, Middle Military Area (Milo M).The coat of arms of the Eastern Military District Staff 1983–1991.