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Weapon systems that would make them easier to attack. >> reporter: easier to copy. this is the $1.4 trillion, u.s., f-35. this is the remarkably similar, chinese j-20 which showed up four years later. here the high altitude drone. and an almost look-alike chinese version. >> it closes the gap. not a gap we want to see closed. >> reporter: the list of compromised systems first reported by "the washington post" was part of a pentagon study that says the u.s. sustained staggering losses. >> probably the greatest national security, immediate challenge, facing the united states. >> reporter: all th...

Treated at the scene for shock. these guys eventually ditched their i can boos, leaving them on a golf course nearby. now the hunt is on for them. police are looking for them in london. if we get anymore information we'll pass it along. jon: crazy stuff. rick, thank you. jenna: new information on the threat posed by china with word that the nation is less than two years away from deploying nuclear armed submarines. this comes as we get the first glimpse of china's latest stealth fighter jet. nothing national security correspondent jennifer griffin is appropriately covering this part of the sto...

announced candidate's past, charges of hypocrisy and where he fits into the growing field of contenders. we want to welcome our viewers in the united states and around the world. i'm wolf blitzer. you're in "the situation room." two weeks after the death of osama bin laden we've learned u.s. navy s.e.a.l.s who stormed the compound and killed him had cameras on their helmets. while we've been showing you an animated version of what likely happened that night, u.s. officials now are studying actual digital recordings of the raid. our pentagon correspondent chris lawrence is here in "...

Makes distinguishable differences. we'll show you examples. first what a standard black hawk helicopter sounds like. this has a rhythmic, 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 toward you or moving away. experts say the small wings, called stabilizers, are also unique to this chopper. they're usually at a hard right angle, but these are an...

Attack that might be able to go after the helicopter. >> reporter: experts say the sound suppression technology makes some differences. first, what a standard blackhawk helicopter sounds like. this has a rihythmic kind of woosh-woosh sound. now we'll show you what a stealth helicopter sounds like. experts say this sounds a lot more vague. you may not be able to tell whether this is another vehicle entirely or helicopter. you may not be able to tell whether the helicopter's moving towards you or moving away. experts say the small wings, called stabilizers, are also unique to this chopper. they'...