Soldier
An army person is someone in the army. What are those people called? They're soldiers.
ぐんじん
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.
おきなわにはアメリカ軍のき地があるから、軍人さんがたくさんいます。
Because there are American military bases in Okinawa, there are a lot of soldiers.
その軍人の勇気ある行動が、多くの人の命をすくいました。
That soldier's brave acts saved a lot of lives.
昨日、上司に俺はリストラで首になるって言われちゃってさ。だから、今、軍人になることを真剣に考えてるんだ。
My boss told me yesterday that I am going to be fired, so now I’m seriously thinking about becoming a soldier.