serving a prison sentence
服役中の人に会いに行ったことってある？
Have you ever visited someone in prison?
彼の息子は服役中である。
His son is serving a prison sentence.
“服役中のショーティにも手紙を”
A letter to Shorty in prison, too.
— マルコムＸ (1992)
トムはまだ服役中だよ。
Tom is still serving his sentence.