Any person guilty of mutiny, treason, spying, or desertion, or who, because of conscientious objections, refuses to perform service in the Armed Forces of the United States or refuses to wear the uniform of such force, shall forfeit all rights to Servicemembers’ Group Life Insurance and Veterans’ Group Life Insurance under this subchapter. No such insurance shall be payable for death inflicted as a lawful punishment for crime or for military or naval offense, except when inflicted by an enemy of the United States.