10 U.S.C. § 8294

The President may award a silver star medal of appropriate design, with ribbons and appurtenances, to a person who, while serving in any capacity with the Navy or Marine Corps, is cited for gallantry in action that does not warrant a medal of honor or Navy cross— (1) while engaged in an action against an enemy of the United States; (2) while engaged in military operations involving conflict with an opposing foreign force; or (3) while serving with friendly foreign forces engaged in an armed conflict against an opposing armed force in which the United States is not a belligerent party.