naval militia; maritime militia
Refers to a militia force operating at sea, often in a paramilitary or auxiliary capacity. The term is used in geopolitical and military contexts.
Maritime militias sometimes operate disguised as fishing vessels in disputed waters.
Compound of 海上 (かいじょう, 'maritime') and 民兵 (みんぺい, 'militia'). The term is a modern coinage, likely influenced by English 'maritime militia' or Chinese 海上民兵 (hǎishàng mínbīng).