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The u.s. army had 10,000 for century duty, carrying messages and other critical jobs. today, there are only 2,700 at work in the military. but that number is rapidly growing and never before have they been in such specialized roles. in afghanistan, they are so prized for their ability to work around the clock, that general david petraeus has said the capability they bring to the fight cannot be replicated by man or machine. especially for dangerous work like checking for car bombs. >> we can send a dog in there without anybody getting close to the vehicle and you're not risking harm to anyone ...

Roles. in afghanistan, they are so prized for their ability to work around the clock, that general david petraeus has said the capability they bring to the fight cannot be replicated by man or machine. especially for dangerous work like checking for car bombs. >> we can send a dog in there without anybody getting close to the vehicle and you're not risking harm to anyone directly. the dogs can indicate whether there's anything in the vehicle or not. >> reporter: to purchase and train a single combat dog costs $50,000. and companies like canine storm have built a multimillion dollar industry ar...

U.s. elite team that took him out has four legs. yes, man's best friend was used in the raid on the terrorist leader's hideout. man's best friend, of course s the dog. and that's the subject of today's big breakdown. canines and combat. it is not surprised to learn that a dog was learned in the mission, because dogs have been fighting alongside u.s. troops for hundreds of years and playing a pivotal role in the u.s. operations. from being in combat zones to comforting soldiers in the aftermath of duty. new york times quoting david petraeus as saying that the dogs are useful because of the capa...

He's with us today. martha: the daily doubles got nothing on this question. who won, man or machine. it's frightening, folks. now we know the answer.

Hasn't done anything wrong and we feel comfortable in that front. >> it's not that clear. simply put, does president believe he is above the law? >> certainly no one is above the law. >> he said in his tweet that he has the right to pardon himself. does he assume that special counsel will find him guilty of something. >> no, because he hasn't done anything wrong. >> she said it again and again, what she did not do was rule out the president pardoning himself. some republican lawmakers seem to be unimpressed by that idea. some democrahink even worse. >> if i were president of the united states ...