 In June 1942 , Shōkaku and Zuikaku had their anti @-@ aircraft armament augmented with six more triple 25 mm mounts , two each at the bow and stern , and one each fore and aft of the island . The bow and stern groups each received a Type 95 director . In October another triple 25 mm mount was added at the bow and stern and 10 single mounts were added before the Battle of the Philippine Sea in June 1944 . After the battle , Zuikaku 's anti @-@ aircraft armament was reinforced with 26 single mounts for the 25 mm Type 96 gun , bringing the total of 25 mm barrels to 96 , 60 in 20 triple mounts and 36 single mounts . These guns were supplemented by eight 28 @-@ round AA rocket launchers . Each 12 @-@ centimeter ( 4 @.@ 7 in ) rocket weighed 22 @.@ 5 kilograms ( 50 lb ) and had a maximum velocity of 200 m / s ( 660 ft / s ) . Their maximum range was 4 @,@ 800 meters ( 5 @,@ 200 yd ) . 
