The Purple Heart is awarded in the name of the President of the United States to any member of the Armed Forces of the United States who, while serving under competent authority in any capacity with one of the U.S. Armed Services after April 5, 1917, has been wounded or killed. Specific examples of services which warrant the Purple Heart include any action against an enemy of the United States; any action with an opposing armed force of a foreign country in which the Armed Forces of the United States are or have been engaged; 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; as a result of an act of any such enemy of opposing armed forces; or as the result of an act of any hostile foreign force. After March 28, 1973, it may be awarded as a result of an international terrorist attack against the United States or a foreign nation friendly to the United States, recognized as such an attack by the Secretary of the Army, or jointly by the Secretaries of the separate armed services concerned if persons from more than one service are wounded in the attack. After March 28, 1973, it may be awarded as a result of military operations while serving outside the territory of the United States as part of a peacekeeping force.
The Purple Heart differs from most other decorations in that an individual is not “recommended” for the decoration; rather he or she is entitled to it upon meeting specific criteria. A Purple Heart is awarded for the first wound suffered under conditions indicated above, but for each subsequent award, an oak leaf cluster or 5/16 inch star is worn in lieu of another medal. Not more than one award will be made for more than one wound or injury received at the same instant. wikipedia