Kaiheidan /海兵団, Naval Corps/were units in the Imperial Japanese Navy that were primarily responsible for the training and education of enlisted and non-commissioned officer personnel. In particular, they trained the new recruits after they were recruited by the local recruitment centers around Japan. Each of the four naval districts (Yokosuka, Kure, Sasebo and Maizuru) had its own Kaiheidan. In addition, they also served as the base defence force in the secondary role.
The training and education were aimed at both the navy personnel who were later assigned to land units, such as Japanese Special Naval Landing Forces, and those who were later assigned to warships. The process involved both physical/combat skill development and technical education, and it was divided into several categories, each with a particular specialization. The main branches included sailor, maintenance, mechanic and engineer, while the extra branches included medic, paymaster and military band. Some of the most physically demanding exercises during the training were swimming and rowing in a boat as a team of several recruits.
The training and education were aimed at both the navy personnel who were later assigned to land units, such as Japanese Special Naval Landing Forces, and those who were later assigned to warships. The process involved both physical/combat skill development and technical education, and it was divided into several categories, each with a particular specialization. The main branches included sailor, maintenance, mechanic and engineer, while the extra branches included medic, paymaster and military band. Some of the most physically demanding exercises during the training were swimming and rowing in a boat as a team of several recruits.
See also https://asiamedals.info/threads/yok...rse-graduation-commemorative-watch-fob.27162/
2nd and 4th Class of 1943.
Obverse
必勝 - Certain Victory
reverse
横須賀第一海兵團 - Yokosuka 1st Kaiheidan
短第二期豫備練習生 - Short [Term Course] 2nd Class Reserve Trainee
卒業記念 - Graduation Commemorative
第四期豫備練習生 - 4th Class Reserve Trainee Training Course
2603 - 1943
Another example.