 Those were elements of the 140th Mechanised Brigade in Zagreb, the 31st Armoured Brigade in Dugo Selo near Zagreb, the 12th Proletarian Mechanised Brigade in Osijek, the 11th Marine Infantry Brigade in Šibenik and the 139th Marine Infantry Brigade in Pula.In 1990, the "A" classificationrequiring 60–100% troop levels, was assigned to the 4th Armoured Brigade in Jastrebarsko, a battalion of the 622nd Motorised Brigade in Petrinja, the 13th Proletarian Motorised Brigade in Rijeka, and the 265th Mechanised Brigade in Bjelovar and Koprivnica.The 221st Motorised Brigade based in Knin was reinforced with "A" class armoured and mechanised battalions.