n.海军陆战队员
I did not know his nephew Jack became a leatherneck.
我不知道他的侄子杰克已加入海军陆战队.
A leatherneck or a grunt do not names to call someone.
海军陆战队员(leatherneck)和美国步兵(grunt)都不是对他人的合适称呼.