Enlist
Noun and する verb
にゅうたい
日本人男性がアメリカ軍に入隊することはできますか。
Can a Japanese man enlist in the U.S. army?
Enter into a squad... an army squad. When you do this, you enlist in the army.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.