The Purple Heart is awarded for "being wounded or killed in any action against an enemy of the United States ..."
It's currently being awarded and has been since 1932.
|Lt.Cdr.||Craig, John Richard, USN||1943||USS Grampus (i) (207)|
|T/Cdr.||Evans, Ernest Edwin, USN||1 Jan 1944||USS Johnston (i) (DD 557)|
Note: This listing is still being compiled and some recipients might be missing.
For US officers the date listed is usually the date of the action worthy of the award - not the award date itself.