of the ship, were fitted to control the Type 89 guns. Each director mounted a rangefinder. When Jun'yō was 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 early-warning radars. The first of these was mounted on the top of the island in July 1942, shortly after she was completed, and the other was added later in the year on the port side of the hull, outboard of the rear elevator. A smaller Type 3, Mark 1, Model 3 early-warning radar was added in 1944. Career Jun'yōs keel was laid down by Mitsubishi on Slipway No. 3 at their shipyard in Nagasaki on 20 March 1939. She was yard number 900 and had the name Kashiwara Maru at that time. The ship was purchased on 10 February 1941 by the Navy Ministry and she was temporarily referred to as No. 1001 Ship (Dai 1001 bankan) to keep her conversion secret. She was launched on 26 June 1941 and commissioned on 3 May 1942 as Jun'yō. Upon commissioning, the ship was assigned to the Fourth Carrier Division of the 1st Air Fleet, together with , under the command of Rear Admiral Kakuji Kakuta. She was tasked to support Operation AL, an attack planned to seize several Aleutian Islands to provide advance warning in case of an American attack from the Aleutians down the Kurile Islands while the main body of the American fleet was occupied defending Midway. Jun'yō carried 18 A6M2 Zeros and 18 D3As for this operation. At dawn on 3 June, she launched 9 Zeros and a dozen D3As to attack Dutch Harbor on Unalaska Island. They had to turn back due to bad weather, although an American PBY Catalina reconnaissance aircraft was shot down by a Zero. A second airstrike was launched later in the day to attack a group of destroyers discovered by aircraft from the first attack, but they failed to find the targets. Another airstrike was launched on the following day by the two carriers that consisted of 15 Zeros, 11 D3As, and 6 B5Ns and successfully bombed Dutch Harbor. As the aircraft from Jun'yō were regrouping after the attack, they were attacked by 8 Curtiss P-40 fighters that shot down 2