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Design work started before World War II began , but problems with engines , metallurgy and top-level interference kept the aircraft from operational status with the Luftwaffe until mid-1944 .
 event: World War II; organization: Luftwaffe
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: World War II, Luftwaffe 
Answer:
 event: World War II; organization: Luftwaffe