technical

Short for 海上自衛隊 (Kaijō Jieitai, “Japan Maritime Self-Defense Force, JMSDF”).

always

naval warships and commercial, seagoing vessels

high-class, advanced

height, altitude / high class, high grade, high degree

main sea, ocean

護る: to protect, to defend / to watch carefully / to abide (by rules), to observe (regulations)

(archaic) to stand watch over something, to be on the lookout for something (such as a watchman controlling entry to a place) / (archaic) to protect or defend something, to ensure that something is safe

(Classical Japanese) to be watching continuously, to be on watch repeatedly, to be on look out / (Classical Japanese) to protect something, to take care of something