a total of 91 25 mm barrels; 57 in 19 triple mounts, four in two twin mounts, and 30 single mounts. Two Type 94 high-angle fire-control directors, one on each side of the ship, were fitted to control the Type 89 guns. Each director mounted a rangefinder. When Jun'yō first commissioned only the rangefinders were fitted and the directors were added later. Four Type 95 directors controlled the 25 mm guns and another pair were added in early 1943. Early warning was provided by two Type 2, Mark 2, Model 1 air search radars. The first of these was mounted on the top of the island in mid- to late 1942 on each ship, and the other was added during 1943. This latter system was fitted on the port side of the hull, outboard of the rear elevator. A smaller Type 3, Mark 1, Model 3 air search radar was added in 1944 on Jun'yō. Ships Service history The ships were purchased on 10 February 1941 by the Navy Ministry for the price of ¥48,346,000 and their armament and aircraft cost an additional ¥27,800,000. The cost to convert the two ships was budgeted at ¥38,073,000, for a grand total of ¥114,219,000. Kashiwara Maru and Izumo Maru were temporarily referred to as No. 1001 Ship (Dai 1001 bankan) and No. 1002 Ship respectively to keep their conversions secret. Jun'yō was initially classified as an auxiliary aircraft carrier (Tokusetsu kokubokan), but following the loss of four Japanese fleet carriers in the Battle of Midway, she was redesignated as a regular carrier (Kokubokan) in July; Hiyō, completed after the loss of the carriers, received that designation from the beginning. Despite being launched several days after Hiyō, Jun'yō was the first of the pair to be commissioned in May 1942. She was assigned to the Fourth Carrier Division of the 1st Air Fleet, together with . The ship was tasked to support the invasion of the Aleutian Islands, an operation designed to coincide with the attack on Midway. Jun'yō carried 18 A6M2 Zeros and 18 D3As for this operation. The ship launched her first airstrike at dawn on 3 June against Dutch Harbor on Unalaska Island. She accomplished little during this operation, losing five aircraft to all causes, and her own aircraft only shot down five American aircraft. Upon arrival at Truk on 9 October, the two sisters were assigned to the Second Carrier