This is the 3805th most frequent Chinese word.
陆军
"陆军" means "army" or "land forces."
Here, "陆军" refers to the army as the land military force of a country, emphasizing its role in defense and strategy.
中国陆军近年来进行了现代化改革。
China's army has undergone modernization reforms in recent years.
In this sentence, "陆军" identifies the branch of the military the brother is affiliated with, specifying his role as a soldier.
我的哥哥是一名陆军士兵。
My older brother is an army soldier.
"陆军" is used to indicate the significance of the ground military force in achieving objectives during a conflict.