noun-modifying (irregular)
antisubmarine
Prenominal modifier used in military and naval contexts, typically in compounds like 対潜戦 (antisubmarine warfare) or 対潜哨戒機 (antisubmarine patrol aircraft).
海上自衛隊は対潜能力の強化を進めている。
The Maritime Self-Defense Force is strengthening its antisubmarine capabilities.