Organization of the Imperial Japanese Navy Alaskan Strike Group
Organization of Japanese Alaskan Strike Group (Aleutians)

Japanese Navy units in the Alaskan Operation

Commander in Chief, Navy Alaskan Strike Group
Boshiro Hosogaya:-Commander-in-Chief, Navy Alaskan Strike Group, Aleutian Campaign

1st Support Group Commander
Boshiro Hosogaya:-command Heavy Cruiser Nachi and two destroyers

2nd Carrier Squad Commander
Kakuji Kakuta:-Lead, Escort Carriers Ryujo (37 aircraft) (among its fighter pilots aboard were Tadayuki Koga), and Junyo (45 aircraft). Both Carriers were equipped with Mitsubishi A6M2 "Zero" fighters, Aichi D3A1 "Val" Dive-bombers and Nakajima B5N2 "Kate" Torpedo-bombers. 3rd Cruiser Division (2° Section)
Comprising the Cruisers Maya, Takao, and three destroyers

Navy Aleutian Occupation force

Attu Group Commander
Sentaro Omori:-led Light Cruiser Abukuma, four destroyers, one minelayer, one transport (1,200 soldiers)

Kiska Group Commander
Takeo Ono:-Guiding the light cruisers Kiso, Tama, one auxiliary cruiser (Asaka Maru), three destroyers, two minelayers, two transports (1,250 soldiers)

Navy Hidro Fighter unit in Aleutian Operation
5th Air Fleet:-equipped with Nakajima A6M2-N "Rufe" floatplane fighters, support operations from Kiska aquatic base, Aleutian islands. Japanese Army Units in the Alaskan Operation

North Seas Detachment Commanders
Matsutoshi Hozumi:-He led one infantry battalion whose mission was to occupy the islands of Attu, Kiska, and Adak, in conjunction with naval units. Juichiro Mineki:-he replaced at Hozumi in command of unit and receiving command of a reinforced group, grown to three infantry battalions, under Commander-in-Chief of the Fifth Fleet. Last Japanese Navy Infantry Commander in Alaskan Campaign
Yasugo Yamazaki:-commander of last Japanese Navy infantry group in Attu Japanese held island

References 

Pacific Ocean theatre of World War II
Alaskan Strike Group
Aleutian Islands campaign