The Japanese marine paratroopers was a marine airborne forces during World War II. The troops were officially part of the Special Naval Landing Forces (SNLF or Rikusentai). They came from the 1st, 2nd and 3rd Yokosuka SNLFs. The 2nd Yokosuka took no part in any airborne operations and became an island defensive base unit. They were under the operational control of the Imperial Japanese Navy Air Service (IJNAS or Dai-Nippon Teikoku Kaigun Koku Hombu). Rikusentai paratroopers should not be confused with the Imperial Japanese Army paratroopers, known as Teishin.
Rikusentai units were grouped in battalion level formations, named after the three naval districts, including Yokosuka. Paratroop units were only organized on the very eve of the war, beginning in September 1941. The lightly armed parachute units were intended to assault and airfield seizure and providing security, assault coastal areas, CQB/CQC, direct action, jungle warfare, mountain warfare, special reconnaissance, supporting amphibious warfare, tracking targets in jungle, and other strategic objectives. They were not meant to become entangled in heavy, pitched land battles. However, their operational use would prove to be contrary to this doctrine.
Formation and tactics
The 1st Yokosuka SNLF (Special Naval Landing Force) was formed 20 September 1941, at Yokosuka Naval District, round a battalion of 520 paratroopers. The 2nd Yokosuka also formed at the Yokosuka port area, 15 October 1941, with 746 men and trained as such, took no part in any airborne operations and became an island defensive base unit. The 3rd Yokosuka was formed on 20 November 1941, again at the Naval facility and consisted of 850 men. This unit was involved in the invasion of Dutch West Timor as airborne inserted infantry, setting off from the captured air base at Kendari.
The paratroopers were led by navy officers who had trained at the Imperial Japanese Army infantry school. Although Rikusentai basic training was different from that of the Japanese Army, the paratroopers were trained at the army base on Kanto Plain. Light arms were furnished from army stocks; heavier material was manufactured by the navy. The first training drop occurred on November 16, 1941.
The Japanese Navy planned to use the paratroop force as a diversion, by co-ordinating the timing of a seaborne assault and parachute drop to create maximum surprise at the point of contact. Rikusentai paratroopers would land inland from beaches where major amphibious assaults were to occur. In particular, it was intended that paratroopers would disable airfields, preventing enemy warplanes from interfering with amphibious landings. The lightly armed paratroopers would have to attack the air base defenses. If they were successful, it would also allow the Japanese to use the airfield for their own warplanes and was comparable to the use of German Fallschirmjager at the Battle of Crete, in May 1941.
Operational history
The 2nd Yokosuka SNLF saw action not as paratroopers, but as an amphibious assault force in the Borneo campaign, from December 1941.
Two companies, numbering 849 paratroopers, from the 1st Yokosuka SNLF, carried out Japan's first ever combat air drop, during the Battle of Menado, in the Netherlands East Indies, on January 11, 1942. Four hours before the airborne landings, the 1st Sasebo SNLF had come ashore by sea nearby.
On February 19, 630 paratroopers from the 3rd Yokosuka SNLF were dropped near Kupang, West Timor, and suffered heavy casualties in the Battle of Timor.
In mid-1942 the 1st Yokosuka SNLF returned to its namesake naval base and what was left of the 3rd Yokosuka took part in unopposed landings on islands in the eastern part of the East Indies archipelago. The 3rd Yokosuka returned to Japan by the end of October 1942.
Equipment
Many weapons were the same as army Teishin units, but some heavy weapons were provided from navy stocks. IJNAS land-based planes — transports, heavy bombers and flying boats — were used to deliver the paratroopers.