A Douglas C-47  "Skytrain" is loaded with more serious casualties - 24 stretchers - to fly back from Saint Laurent-sur-Mer, Normandy, France to a hospital in England. The flight would last 45 minutes. An Army medic and a nurse are on hand to assist; June 1944. 
 

Evacuate casualties by air

Transportation of the wounded aboard the C-46 "Commando" twin engine aircraft from battlefields to the hospital in Manila, the Philippines. Army nurse is on hand to look out for the injured; 1945.

Planeload of casulties

On any battlefield in world war 2 there would be found thousands of men trained to do one thing.. Kill the enemy.
Just a few of all those thousands of men are trained for one other mission... Saving lives.
These men are the combat medics.
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Combat medics or field medics (or medics) are military personnel who have been trained to at least an EMT-B level (16-week course in the U.S. Army), and are responsible for providing first aid and frontline trauma care on the battlefield. They are also responsible for providing continuing medical care in the absence of a readily available physician, including care for disease and battle injuries. Combat medics are normally co-located with the combat troops they serve in order to easily move with the troops and monitor ongoing health.
taken from fb/ WW2 Archives