 Complete the following phrase:  The Luftwaffe was unusual among contemporary independent air forces in possessing an organic paratrooper force called Fallschirmjäger. Established in 1938, they were deployed in parachute operations in 1940 and 1941 and participated in the Battle of Fort Eben-Emael and the Battle for The Hague in May 1940, and during the Battle of Crete in May 1941. However, more than 4,000 Fallschirmjäger were killed during the Crete operation. Afterwards, although continuing to be trained in parachute delivery, paratroopers were only used in a parachute role for smaller-scale operations, such as 