The U.S. got its most wanted criminal when U.S. Special Forces killed Osama bin Laden but the troops left behind a key piece of secret technology they tried to destroy in the frantic, tense minutes when they raided the al-Qaeda leader's northern Pakistan compound: a Stealth Helicopter.

Photographs released immediately after last Sunday's raid showed the rear section of a helicopter survived a blast which apparently decimated much of it. Some experts have said that a modified UH-60 Blackhawk helicopter may have been used in the operation, although others have not discounted the chance that the helicopter on the compund is an entirely new model.

Pakistani security officials were seen loading what appears to be the tail of the helicopter into trucks and covering them with large cloths. 

However the attempts at covering up the parts came too late as some photos of the parts were leaked to the media, eventually winding up on major news services.

What materials the remaining parts are made of, what manufacturig techniques and how those parts may reduce their ability to be detected have yet to be determined.

U.S. officials have already asked for the wreckage back, an unnamed Pakistani official said on Tuesday, according to ABC News.

However that's not the only government with a desire to interact with the wreckage.

The same official said China is very interested and indicated that they may indeed have the opportunity to examine it for themselves.

We might let them [the Chinese] take a look, the official said.

The United States has has refused to comment on the helicopter, except to acknowledge that it had to be left behind and blown up after a hard landing.

Experts weighing in on the design of the tail rotor's cover have noted that it may have been built in such a way as to go undetected by radar. Another advantage of the design, experts say, is that it may have reduced noise.

The United States is already dealing with concerns about spying from China.

The U.S. federal government has prosecuted nearly 60 individuals since 2008 related to the transfer of U.S.-based information to China, according to a recent report.

A total of 57 defendants since 2008 have been charged by prosecutors with espionage conspiracies with China or efforts to pass classified information, technology or trade secrets to intelligence operatives, state-sponsored entities, private individuals or businesses in China, according to a review of U.S. Justice Department cases from the Associated Press released Saturday.