It was - at all of the major airborne operations (Normandy, Market-Garden, and Operation Varsity (Rhine crossing)).As I recall, the DC-3 was also a glider tow plane in Europe during WWII.
Another DC-3 in Action. Here she shows that she is still up for Modern adventure. (Scroll down the article for the photo.)
http://www.rcinet.ca/en/2018/04/11/amazing-discovery-under-high-arctic-ice/