of excessive weight. For transportation of carriages, Voroshilovets tracked gun tractors were used. Less powerful Komintern tracked gun tractors were employed to pull gun carts. Organization and service As of June 1941, the Br-2 guns were issued to the heavy gun regiment of the Reserve of the Main Command. The regiment consisted of four battalions, each with three two-gun batteries, totaling 24 pieces. Two independent two-gun batteries also existed. After the outbreak of the German-Soviet War, the gun was employed by independent six-gun battalions. Later the organization was changed once again, to super heavy gun regiments of four two-gun batteries, totaling six Br-2 and two 210 mm gun M1939 (Br-17). By May 1945, the Red Army had four such regiments. The Br-2 (or possibly B-30) saw combat in the Winter War against Finland, one piece was lost. As of June 1941, the RKKA possessed 37 or 38 pieces, of them 24 in the aforementioned heavy artillery regiment and further four in two independent batteries. These batteries were given to the Arkhangelsk military district for use as coastal artillery. The rest of the guns, mainly early production guns with shallow rifling and experimental pieces, remained in storage depots and proving grounds. There is only a fragmentary information of the actual combat use of the Br-2. Some sources mention the guns being used in the Battle of Kursk; the 8th Guards Army employed them in the Battle of the Seelow Heights. By the end of the war, Reserve of the Main Command still had 28 pieces, so apparently none were lost. The modernized Br-2M remained in service at least until the 1970s. Surviving pieces can be seen in the Central Armed Forces Museum (Moscow), in the Artillery Museum (Saint Petersburg) and on the Sapun Mountain (Sevastopol). Variants Br-2 with built-up barrel - experimental piece. Br-2 with shallow rifling - at least seven pieces manufactured in 1936–37. Br-2 with 162 mm barrel - experimental piece. Br-2 with deep rifling - 27 pieces in 1939–40. Br-2M - Br-2 barrel on a new wheeled carriage, adopted in 1955. Self-propelled mounts The only self-propelled mount of the Br-2 was a variant of the experimental SU-14, based on the chassis of the T-35 heavy tank with elements of T-28 medium tank, and intended to carry either 203 mm howitzer or 152 mm gun. The prototype armed with Br-2 is referred to as SU-14Br-2. In Autumn 1941 the