He continued to work hard and finally acquired a skill that surpassed his classmates.

He enlisted in the navy.

He enlisted in the army.

He is a member of the air force.

My house is in Yamaguchi County.

I saw a flock of birds flying in the park.

He is known as the leader of all the armies.

They returned to the battlefield to help the general of the defeated army.

We analyzed the data of the experimental group.

Mimana was an ancient Japanese place name, located in the southern part of present-day Korea.