Since 1917 when it was written, many men in the army have sung, “You’re in the army now. You’ll never get rich by digging a ditch. You’re in the army now.”
Even longer than that, believers --- men, women, boys and girls --- have sung, “We’re in the Lord’s army.” The Apostle Paul told the Ephesians in 6:10-20 they were soldiers of Christ, and that they were to “be strong in the Lord, and in the strength of His might.”