Crashed Copter Sparks Concern About Secrets
According to U.S. officials, two Black Hawk helicopters carrying Navy SEALs landed in the compound in Abbottabad, while two other helicopters circled overhead. One Black Hawk was disabled during the landing, and had to be destroyed by the commandos.
However, remnants of the helicopter, including a nearly intact piece of its tail, suggested that the aircraft involved in the raid wasn't the typical MH-60 Black Hawk flown by special-operations forces. Aviation experts who scrutinized photos of the scene say the tail had unusual features that suggested the helicopter had been extensively modified to fly quietly, while appearing less visible to radar.
The U.S. military has tried in the past to build a stealth helicopter, but has kept secret if it has indeed succeeded.
Crashed Copter Sparks Concern About Secrets - WSJ.com