Remember how 米国 is "America." Well, more of that again. With 米 representing "America" you can combine that with 兵 (soldier) to have yourself a US soldier / American soldier.
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.
Why is that US soldier wearing pince-nez glasses?
Lots of American soldiers walk through here, so please make sure you're not in their way.
"Wow. What beautiful weather! I feel like I'll finally be able to do 300 sit ups today," said an American soldier.