A specific a specific search when daylight comes in a few hours. Its not clear what theyre zeroing in on right now. The search zone has shifted again. This time a little bit to the north. Officials say theyre refining the zone based on continuing analysis of Satellite Communications and the planes capabilities. Just a few hours search crews will get some hightech help. The australia vessel, ocean shield, is expected to arrive carrying a device that could help find the pingers on the data recorders. The batteries on those pingers are expected to run out in about four or five days. Its a race to find any sign of Malaysia Airlines flight 370 off the coast of australia. Those pingers and data recorders are about to run out of power and they will go silent. This comes as the search zone shifts once again, as i said, to the north. Our own will ripley is joining us from perth, australia. Thats the staging point for all these ships and planes involved in this search. Youve got some new information. Will, walk us through what youve learned. Reporter yeah, well, just within the past hour the Australian Defense force confirming this to cnn. So lets start with the first news. The british ship, the shield, that will be conducting a specific search, we dont know what theyre looking for but this means that its not random. They are going to a specific location looking for something. What that is we just dont know right now. But a specific search and this is really the first time were seeing this happen as opposed to the random search where planes and ships are just kind of scanning the ocean floor and looking for anything that they could possibly see. The other big announcement, the big operations announcement, will be coming later on today on friday here in perth from angus, houston, who is overseeing the joint operations coordinating this whole thing. Again, we dont know what the announcements going to be but were told a major operations announcement is coming. And then the ocean shield just hours away now from the search zone arriving slightly behind schedule, but now arriving to this new search zone to the north with those hightech tools from the u. S. Navy. So in addition to the ocean shield arriving we also have the british submarine in the area listening. We have the echo listening as well. So all of these are signs, wolf, that this search effort is really ramping up. What are you hearing from your sources over there, will . As you know, four, five, maybe six days the batteries will dry up that are operating those pingers, if you will, from the flight data and cockpit voice recorders. What are they saying to you about the possibility that they will actually find those socalled black boxes . Reporter well, you know, i think everybody is we have to be realistic here. Because were still talking about a huge area thats being searched, an area that is being constantly refined. You know, you notice that theyre moving the track up to the north. Theres a reason for that. The reason being that the plane traveling at a low altitude may have been burning fuel more quickly. And so the thought is move the search area up north perhaps the plane went down earlier in its flight path than what the data originally showed. But, again, we have to be cautious here because weve had a lot of promising leads over the weeks as we followed this story, wolf, that turned out to be nothing. But to hear theres a specific search happening tomorrow, its certainly an Interesting Development that were definitely going to stay on top of. And there will be in a few hours a major announcement of what theyre calling a big development. We dont know what that is, but thats obviously something that is certainly raising a lot of expectations. All right, will, standby. Well get back to you. Much more on the mystery of flight 370 coming up. Lets go to ft. Hood, texas, right now. The military base is reeling from the second deadly shooting in five years. Heres the latest on what we know. Officials say the gunman, specialist ivan lopez, went from one building to a second firing at the victims with a. 45 caliber handgun. Army secretary john mccue says lopez was being treated for depression, anxiety and sleep disturbances. He was being evaluated to determine whether he suffered from posttraumatic stress disorder but had not been diagnosed. Lopez served four months in iraq back in 2011 and had just arrived at ft. Hood, texas, from another base in february. A neighbor says lopez and his wife looked like a normal couple and they would smile whenever theyd see someone. Right now investigators are looking for anything in his military record that might explain his deadly rampage. The Army Secretary says so far they havent seen any red flags. He was seen just last month by a psychiatrist. He was fully examined. And as of this morning we had no indication on the record of that examination that there was any sign of likely violence either to himself or others. No suicidal ideation. So the plan forward was to just continue to monitor and to treat him as deemed appropriate. Our pentagon correspondent, barbara starr, has more now on lopezs military history. Our George Howell is in killeen, texas, thats the home of ft. Hood. Barbara, first to you. Do we know whether he actually saw combat . He served in iraq for four years. Any indication he was injured at the time . Actually, wolf, he served for four months. Let me just correct that. Four months, youre right. Yeah, let me clarify that. And thats whats so interesting, four months at the end of 2011 when the u. S. Was wrapping up its operations in iraq. And basically he was a truck driver. Those are the months in which they would send soldiers in to drive vehicles and equipment out of iraq, essentially drive it back to kuwait. We have every reason to believe that is some of the work he did. No indication that he saw any kind of combat in terms of what other soldiers had been through. No record that he got a purple heart that he was ever wounded. Was it traumatic to him . That is something to be determined. He reported at some point that he felt he had traumatic brain injury, and he was being evaluated for posttraumatic stress. No formal diagnosis of that yet. But secretary mccue that you saw there a moment ago also said that lopez was on a variety of medications. He named one of them publicly, ambien. So all of this, this entire medical, physical, Mental Health history is going to be part of what investigators now are going to look at to try and determine what was going on with this soldier. Were there any warning signs that might have been overlooked . Obviously no more u. S. Troops in iraq, barbara. But correct me if im wrong, wasnt it normal for u. S. Soldiers who served in iraq to be deployed there for a year at a time . Because when i heard he was deployed for four months that raised some flags in my mind. But what was going on . Why was he there only for four months . Well, we still have to get the full answer on that. The army has yet to release his full military record. But youre right, wolf. Let me say that some of the troops who saw really the worst combat years of iraq served 15month tours, as you recall. Most served a 12month tour. But at the very end in 2011 as the u. S. Was finishing up pulling out by december of 2011, during those last couple of months they would send individual soldiers in, or small units in, to work on all that equipment. Tons and tons of equipment and get it driven out of iraq back to kuwait. He was a truck driver for the army. He works those final months in iraq. So the thinking at this point by several sources ive spoken to is thats likely the specific work that he was doing, driving vehicles, working on them, maintaining them in those final months and weeks of the u. S. War in iraq. Wolf. Barbara, thanks very much. Were going to learn a lot more about ivan lopez in the coming hours and days. Lets go to George Howell there at ft. Hood. This is the second deadly shooting at ft. Hood, as you know, george, in five years. Major nadal hasan convicted in a rampage that killed 13 people, one civilian, wounded 32 others. Walk us through this latest shooting unfolded whether there were changes in place since 2009. We do know, wolf, of a couple changes here on post. We know first of all there was sort of a Neighborhood Watch here if you will on post. People looking out for potential problems. Thats one thing. We also know commanders were trained to look out for instances of workplace violence. And dispatchers they have new abilities now basically to pinpoint the location of phone calls as theyre coming in, when theyre dealing with the situation like we saw the other day. Wolf, you have to consider it was a very traumatic situation for folks here. Theyve dealt with it before as you mentioned in 2009. They dealt with it again yesterday. A situation where the sirens were blaring, people were told to shelter in place. This base was on lockdown. And as we understand it that he went basically from one building to the next, between two buildings, a medical building, a transportation building. Went into one building, fired shots, got into his car, fired shots and went into this second building. Thats where he was met by that military officer, thats when he used his weapon to take his own life. What do we know, george, about the 16 people who were wounded . Reporter at this point we did get some information just recently from scott and we know nine patients are at that particular hospital. A total of 16 people injured here, but nine at that hospital. Of the nine three remain in Critical Condition. So we continue to monitor, were keeping in touch with our sources there at the hospital. We know that some of the patients are doing better. Some may be discharged today. Again, a total of 16 people who were injured, wolf. Three people who were killed in this shooting not including the suspect here who took his own life. George howell at ft. Hood for us. Thank you. When we return well dig deeper into the flight 370 investigation and the challenges facing search crews right now. They now only have a few days left before the Battery Power on the flight recorder pingers runs out. And later, credit for ending the killing spree at ft. Hood is now going to a military Police Officer who confronted the gunman. 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Maybe theyll last a little bit longer, tuesday or wednesday, well see. But lets bring in our panel of experts to talk about todays developments. Mark weiss, former 777 pilot for american airlines. Peter goelz, former ntsb managing director. Tom fuentes, former assistant director of the fbi. Tom, so australian officials, they say they have a major announcement a few hours from now. Its already approaching friday morning over there. A big announcement they say i have no idea what it is, are you hearing anything . They raised these expectations and inevitably at least over the past four weeks we have been disappointed. But they say big announcement, what are they talking about . Sfwl i dont know, wolf. I agree. How many times have they done this now, raise the expectations, raise the excitement level only to find nothing. And i mean, send the ship out there and find something then you can jump up and down about it. But they did say now that theyre looking at a specific area. Theyre sending the ship with sonar to look at a specific area, which indicates to me maybe theyre onto something that they havent told us about yet. Maybe they got a piece of wreckage. Maybe the sub picked up a faint ping. We can only hope. Maybe theyre simply expanding, you know, the fleet thats searching for it. But lets hope its something good and something solid. Mark, they have to really be careful because families are listening to every word. Their hearts go up, they go down. Theyre so confused. Theyre so frustrated. Totally understandable because of the ups and downs of the Public Comments by malaysian and occasionally australian officials as well. Absolutely. I mean, the families dont know who to trust, who to listen to or what to believe. And when you think about how much how Little Information really is out there that we can go on, i mean, you know this refining an area perhaps theyve done some more studies with altitude and distance the plane may have covered. Whats the batteries for the flight data, the cockpit voice recorders are gone, the pingers, it becomes a whole new search operation, right . It becomes a very difficult search once the batteries are gone. Describe the difference in searching for these flight data and cockpit voice recorders when theyre pinging and when theyre not. Well, when theyre pinging you at least have a two or threemile underwater area that you can hear. When they shut down youve got to be directly on top of it. Youre using side scanning sonar that has a far limited area to search. Youve got remote vehicles that are looking with cameras, which are very limited. It becomes a very challenging and longterm operation. It took two years just to get some perspective to find that air france jet liner that went off the coast of brazil in the Atlantic Ocean even though they found some debris, some wreckage five days in after the crash, it took two years after that to find the cockpit voice recorders, the data recorders. Just to give it some perspective. You wanted to make a point . No, im saying that this is if we dont find something in the next week, we are in for the long haul. And whats also frustrating is that once again theyre refining the search zone. They seem to be doing this a lot lately. Well, thats why i say just go do the searches. Get it done. Find something. Then come back and get people excited. Dont raise these hopes over and over and over only to later be pessimistic when you didnt find anything. I can only assume theyre refining the search zone and then moved it north 700 miles and then closer to australia, east a couple hundred miles, now theyre moving it north a little bit. Is that because of the currents . They think maybe or they simply havent seen anything in the earlier search zones so theyre going to adjacent areas . Well, certainly going to go to adjacent areas because they havent found anything. But again this is not a static situation as you would have on the ground. This is the moving currents. But the other thing and i really do believe theyve probably refined some of the search area based upon the handshake pings. But now new calculations on altitude, speed and the range that the aircraft could have covered and winds aloft at various altitudes. And its like a lawn mower, right, peter . Theyre searching all those areas going up and down, a whole bunch of planes from different nations doing it. Ive seen charts from a number of searches very detailed, very painstaking, very slow. Very frustrating. All right, guys, lets see what this big announcement that theyre about to make in a few hours actually is and how specific theyre going now for the sonar detection in this search area. Maybe theyre onto something we can only hope. Just ahead, the ft. Hood shooter was not supposed to bring his gun on base. Ill ask a u. S. Congressman who represents ft. 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