tenant moved out early but in army?

[Jimmy S.]

coupled moved in signed 1 year lease. 3 months into lease they split up and now he can't afford it by himself. Now hes trying and just got deployed in the army. Do I have to give them back their "last month rent" and security deposit because hes in the army? He told me there's some law that protects him in-case he gets deployed (told me when he moved in). He gave me 7 days notice not 30 like required.  States in lease I need 30 days notice and move out early you forfeit last months rent and security deposit.