Deuteronomy 20:5

20:5 Moreover, the officers are to say to the troops, “Who among you has built a new house and not dedicated it? He may go home, lest he die in battle and someone else dedicate it.

Deuteronomy 24:5

24:5 When a man is newly married, he need not go into the army nor be obligated in any way; he must be free to stay at home for a full year and bring joy to the wife he has married.