Who operates the McDonnell Douglas F-15 Eagle and what is its powerplant?
SELECT ?ans_1 ?ans_2 WHERE { wd:Q29251 wdt:P137 ?ans_1 . wd:Q29251 wdt:P516 ?ans_2 }
mcdonnell douglas f-15 eagle: Q29251 mcdonnell douglas f-15 eagle: Q29251