It is a fact that...
1. The US spy drone taken down by Iran in Dec 2011 was classified "above top secret" by the Pentagon.
2. The US spy drone displayed by Iran AFTER they captured it was in near pristine condition. The drone was shown on Iranian TV. The capture is not controversial. It did happen. The US acknowledged it.
3. The US investigation into what happened -- why the drone was captured -- was/is top secret.