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Angle. but these are angled off, analysts say, to avoid radar detection. the chinese have a huge interest in this technology. they are developing a stealth fighter jet called the j-20 which they have already test flown. contacted by cnn, a chinese official here at washington said he had no information on whether his government has tried to get access to the tail section of this helicopter. u.s. officials are not commenting on reports they have asked the pakistanis to give the wreckage back. >> we are also getting new details of the crash landing that that stealth helicopter made in that -- at ...

About china's military buildup, jen per? >> reporter: well, i would say very concerned, jon. in fact, what they are hooking and what they point to is the surge in galloping defense expenditure. in the last 20 years, china's defense budget has gone up by 464%. compare that to u.s. defense spending which has risen in the same period of time by just 30%. and with the pentagon cutting back and china continuing to invest about 10%, their budgets are going up by 10% a year, this has people concerned. this terms of submarines, china has bought 30 submarines in the past decade, the u.s. navy, in compa...

Back to a missile attack that might be able to go after the helicopter. >> reporter: experts say the sound suppression technology makes distinguishable differences. first, what a standard black hawk helicopter sounds like. this has a rhythmic kind of whoosh-whoosh sound. now we'll show you what a stealth helicopter sounds like from an earlier test program. experts say this sounds a lot more vague. you may not be able to tell whether this is another vehicle entirely or a helicopter. you may not be able to tell whether the helicopter is moving towards you or moving away. >> experts say the small...