WASHINGTON—The crash of a helicopter involved in the raid on Osama bin Laden's Pakistani hideout has prompted intense speculation about whether the aircraft was specially modified to fly stealthily—and whether its remains could offer hostile governments clues to sensitive U.S. military technology.

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...