"The original Purple Heart, designated as the Badge of Military Merit, was established by George Washington—then the commander-in-chief of the Continental Army—by order from his Newburgh, New York headquarters on August 7 ?. The actual order includes the phrase, "Let it be known that he who wears the military order of the purple heart has given of his blood in the defense of his homeland and shall forever be revered by his fellow countrymen." The Badge of Military Merit was only awarded to three Revolutionary War soldiers and fell into disuse following the War of Independence. Although never abolished, the award of the badge was not proposed again officially until after World War I."
"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 5 April 1917, has been wounded or killed, or who has died after being wounded."
" Enemy-related injuries which justify the award of the Purple Heart include injury caused by enemy bullet, shrapnel, or other projectile created by enemy action; injury caused by enemy placed land mine, naval mine, or trap; injury caused by enemy released chemical, biological, or nuclear agent; injury caused by vehicle or aircraft accident resulting from enemy fire; concussion injuries caused as a result of enemy generated explosions.
Injuries or wounds which do not qualify for award of the Purple Heart include frostbite or trench foot injuries; heat stroke; food poisoning not caused by enemy agents; chemical, biological, or nuclear agents not released by the enemy; battle fatigue; disease not directly caused by enemy agents; accidents, to include explosive, aircraft, vehicular, and other accidental wounding not related to or caused by enemy action; self-inflicted wounds (e.g., a soldier accidentally fires their own gun and the bullet strikes their leg), except when in the heat of battle, and not involving gross negligence; post-traumatic stress disorders; and jump injuries not caused by enemy action."