With three simple words. My name is chris noth and i will listen. From maine to maui, thousands of High School Students across the country are getting in on the action by volunteering in their communities. Chris young action teams of High School Students are joining volunteers of america and Major League Baseball players to help train and inspire the next generation of volunteers. Carlos pea its easy to start an action team at your school so you, too, can get in on the action. If you were a hippie in the 60s, you need to know. Its the dawning of the age of aquarius. Yeah, and Something Else thats cool. What . Osteoporosis is preventable. All osteos preventable . Right on if you dig your bones, protect them. Homeland security was the focus last night at the republican president ial debate in las vegas. 18 Million People watched it on tv, and Major Garrett was there. Marco knows what hes saying isnt true. Reporter firstterm senators marco rubio and ted cruz sparred over Congress Decision toned the governments bulk collection and storage of phone records. Rubio opposed ending the program, and cruz supported it. That tool we lost, the metadata program, was a valuable tool that we no longer have at our disposal. The old program covered 20 to 30 of phone numbers to search for terrorists. The new Program Covers nearly 100 . That gives us greater ability to stop acts of terrorism and he knows that thats the case. I dont think National Television in front of 15 Million People is the place to discuss classified information. Reporter the spat signaled rising tensions between the two as they vie to challenge gop frontrunner donald trump. Today, cruz rebutted rubios implication that he revealed classified information. What i said last night has been widely reported. Its been saturated in the public sphere. This is another example of the Rubio Campaign trying to spread misinformation. One of the most important things a president has to do is be able to handle both the role as the bully pulpit of the white house, but do so in a way that doesnt compromise our National Security. Reporter after the debate, we asked trump how he would balance privacy and security. I have always come down on the side of security. To me its the most important. Reporter even if it means doing something to encroach on the bill of rights . I hate it, i hate the concept of it, but were dealing with some very, very bad dudes. Reporter jeb bush said trumps Foreign Policy proposals were not serious. Hes a chaos candidate. And hed be a chaos president. He would not be the commander in chief we need to keep our country safe. Accuse cruz of releasing classified information. He said he would leave that determination to the Senate Intelligence committee. Scott, the Committee Said there was nothing to investigate. Major garrett covering the campaign. Major, thanks. Tonight, we have a rare look at the battlefield in syria, where u. S. Special Operations Forces are now on the Ground Fighting isis. The americans are supporting allied militias, including kurdish forces, that our Charlie Dagata linked up with near the isis capital city. Reporter the thick fog meant the drive to the front line inside syria was slow. We were about 40 miles from raqqah, the headquarters of isis, but their fighters were just a few miles away and no one wanted to make a wrong turn. Past deserted villages, we finally reached their line of defense. It wasnt much. One of the soldiers looked like he was barely into his teens. U. S. Is training and equipping. Until a few months ago, this whole area was controlled by isis. Gloomy days like these are a nightmare for rebel forces guarding the front lines. Isis militants use the fog as cover to launch sneak attacks. They cant see them coming until its too late to stop them. The group leader told us u. S. Warplanes cant see them, either. And while he said he was grateful for american support, he hadnt actually seen any of the u. S. Special forces now on the ground. But commander Lewland Rojava had. We met him at his base camp deep inside syria. What types of things are you discussing . Mainly coordination on the ground, he told us, weapons and ammunition and who gets them, and they also wanted to see how successful we are in fighting isis on the ground. We also asked villagers what they thought of u. S. Troops if they bring peace and stability he said, theyre welcome. When you found out u. S. Troops were coming here, what did you think . 16yearold omar told us he was simply happy. The commander told us, scott, once u. S. Forces see for themselves what theyre up against, theyll realize they need things like Armored Vehicles and heavy weapons, in addition to guns and ammunition. He also said, depending on how things go, maybe america will send even more forces. Charlie dagata with a report from americas new battlefield in syria. Charlie, thank you. Now the u. S. Has also sent hundreds of troops to west africa, where islamic militants linked to isis are terrorizing villages in a campaign of murder and kidnapping. The americans are there to support cameroons army, and debora patta went along. Reporter cameroons elite up for the days patrol to the nigerian border. Balaclavas provide scant relief against the choking dust. Theyre searching for boko haram, the Extremist Group that has aligned itself with isis and killed more than 20,000 in the past six years. Border towns like kolofata have suffered a string of attacks by suicide bombers recently. Boko haram fighters frequently hide weapons and ammunitions in villages. Sniffer dogs look for explosives as soldiers go from hut to hut. The belief is boko haram could be in any of these homes and not even children are immune from security checks because in the past few months, the suicide bombs in this area have all been delivered by children. The new face of war. But today, they find nothing. Major beltus kwene tells the village to be vigilant. Miles from the border. And youve been attacked here at this base. We underwent a massive attack at this base. Reporter kwene told us since boko haram has pledged allegiance to isis, their tactics have changed. Their bombs are more sophisticated and deployed with deadly frequency. When i see how horrible they can be, i think i will never, ever feel tired to fight against them. Reporter now cameroon is getting help from the u. S. Military that is setting up its first drone base in africa. Here, cameroon soldiers are learning how to use their own drones for surveillance. The u. S. Base wont be fully operational until next month. Captain Victor Guzman the United States forces is providing intelligence, surveillance, and reconnaissance assets to the Cameroon Forces to take the lead, fight the local threat, and not only is it local, but its grown to a global threat. Reporter the u. S. Will have as many as 300 troops on the ground in cameroon by the time its fully operational. Theyre also training the soldiers to prevent suicide attacks. Its critically important, scott, just 12 hours after we left kolofata, it was hit by a suicide bomber killing nine people. Debora patta, remarkable reporting from the heart of africa. Debora, thank you. An attempt to save coral reefs creates an underwater wasteland. And preserving movie classics the cbs overnight news will be lets get these dayquil liquid gels and go. But these liquid gels are new. Mucinex fast max. Its the same difference. This one is max strength and fights mucus. Mucinex fast max. The only cold and flu liquid gel thats maxstrength and fights mucus. I absolutely love my new york apartment, but the rent is outrageous. Good thing geico offers affordable renters insurance. With great coverage it protects my personal belongings should they get damaged, stolen or destroyed. [doorbell] uh, excuse me. Delivery. Hey. Lo mein, szechwan chicken, chopsticks, soy sauce and you got some fortune cookies. Have a good one. Ah, these small new york apartments. Protect your belongings. Let geico help you with renters insurance. politely wait, wait, wait you cant put it in like that, you have to rinse it first. Thats bakedon alfredo. Bakedon . Its never gonna work. Dish issues . Trust your dishwasher with cascade platinum. It powers. Through. Your toughest stuckon food. Better than finish. Weve been changing things up with ky love. Oh yeah. Its a pleasure gel that magnifies both our sensations. It gives us chills in places weve never gotten chills before. Yeah, it makes us feel like. Dare to feel more with new ky love. Start the interview with a firm handshake. Ay,no dont do that try head shoulders instant relief. It cools on contact, and also keeps you 100 flake free. Try head shoulders instant relief. An attempt to save florida coral is wrecking the reef instead. Apparently they didnt think through what sea water does to metal. Heres barry petersen. Reporter theyre off before dawn. Diver thomas pennypacker is on a rescue mission off the coast of ft. Lauderdale, saving a piece of floridas natural coral reef, from this, a massive 35acre graveyard of old tires. Of tires plugging up landfills back in 1970. Up to two million tires bundled by metal clips were dumped here to create an artificial reef. The hope was that they would spur coral growth and attract fish, all good for the environment. Really good idea . Really bad outcome. The clips rusted away. The tires broke free. Storms and constant ocean currents keep the tires moving, dragging across and damaging the fragile living reef nearby, says alex delgado, the dive coordinator. Right now, its just a wasteland. Its tires everywhere. And now we need to correct it before it does additional damage. Reporter down below here is the priority zone, where they had as many as 300,000 tires, but the tires have really spread throughout this area, all the way as far as the beaches of ft. Lauderdale. How you doing down there . Now, were in a pretty good spot. Reporter surrounded by a seemingly endless mound of tires, pennypacker slings them onto lines to be hauled up by a crane. Until he and his team fetch as many as 600 on a good day. Its a race against time. Pat quinn is the Natural Resources specialist for broward county. They wont break apart in our lifetime. Reporter so if you dont get them out of there, theyre just going to be there. Forever. Reporter so far, Florida State funding will bring the number of recovered tires to about 160,000. Not enough, say experts, to protect a reef 7,000 years in the making. Barry petersen, cbs news, off the coast of ft. Lauderdale. Still ahead, years after his setting records. See you on the other side, ray. Nice working with you, dr. Venkman. Bill murray and dan aykroyd in ghostbusters, one of 20 classic movies added today at the film registry at the library of congress, films preserved due to their cultural importance. The list includes top gun, l. A. Confidential, and the Shawshank Redemption with tim robbins and morgan freeman. I guess it comes down to a simple choice, really. Get busy living. Or get busy dying. Fans of Michael Jackson got busy buying his 1982 masterpiece. Today, thriller became the first album to go platinum 30 times over. 30 million sold in the u. S. , more than a million since jackson died in 2009. Next, the new star at the national zoo. Woman what does it feel like when a woman is having a heart attack . Severe shortness of breath. Unexplained nausea. Cold sweats. Theres an unusual tiredness and fatigue. Theres unfamiliar dizziness or lightheadedness. Unusual pain in your back, neck, jaw, one or both arms, even your upper stomach, are signs youre having a heart attack. Dont make excuses. Make the call to 911 immediately. Learn more at womenshealth. Gov heartattack. While i was on a combat patrol in baqubah, iraq, a rocketpropelled grenade took my arm off at the shoulder. I was discharged from the army, and ive been working with the Wounded Warrior project since 2007. Warriors, you dont have to be severely wounded to be with the Wounded Warrior project. We do have a lot of guys that have posttraumatic stress disorder. Being able to share your story, i guess it kind of helps you wrap your mind around what did happen over there. My name is norbie, and yes, i do suffer from posttraumatic stress disorder, the new baby at the national zoo, a baby panda, made its public debut today, so we sent cub reporter chip reid for a look. Reporter getting introduced to the media at four months old is something usually reserved for royalty. Well, thats exactly what bei bei is, the prince of cute. Millions of panda lovers have watched him grow up on the National Zoos pandacam, from birth when he was completely helpless to where he is today, which is just mostly helpless. Doctors say hes in Perfect Health and give much of the credit to mom, who endlessly plays with him, carries him over rocks, slides him across the floor, and nuzzles him to sleep. Animal care at the zoo. Right now, he is entirely dependent upon her, so hes not eating any solid food. Shes nursing him. Thats where he gets all of his nutrients. Everything comes from mom right now. Reporter today mom, or may shong, spent much of her time outside, leaving bei bei in the media glare with his keeper, juan roddriguez, known to bei beis adoring fans as the luckiest man in the world. Do a lot of people tell you, i want your job . Yeah, yeah. Pretty much every day. Being able to work with these guys, it just puts a smile on your face. I mean, you just cant get enough of it. Reporter the public will get to see bei bei in person starting next month. Today, after most of the media throng left, may shong finally returned and those remaining were treated to this the soft embrace of a mothers love. Chip reid, cbs news, washington. And thats the overnight news for this thursday. For some of you, the news continues. For others, check back with us just a little bit later for the cbs this morning. From the Broadcast Center in new york city, im scott pelley. Captions by vitac www. Vitac. Com this is the cbs overnight news. Hi, everyone, and welcome to the overnight news. Public School Students in los angeles are back in class after the entire School System was shut down for a day because of a fake Terror Threat. The High School Kids will be wrapping up their finals with the holiday recess start thing weekend. And the threat of a Terror Strike took center stage in las vegas, as the gop president ial candidates squared off for their final debate of the year. Major garrett has the story. Reporter the debate was an instant capsule. A primetime event which the specter of terrorism and the nations fears about it overshadowed every other topic. The leading voices in the Opposition Party clashed over the details to be sure. In the end, offered an anxious nation a promise, one that could be distilled into one word, or phrase. We will keep america safe. Safe. Safe. Safe. Your safety and securitiy. Were talking about security. Reporter the competition to be tougher on National Security never ended, and jeb bush, running in low single digits, forced his way back into the conversation by repeatedly challenging donald trump. This is a tough business youre a tough guy, jeb. And we need to have a leader youre never going to be president of the United States by insulting your way. Lets see, im at 43 , youre at 3 . So far im doing better. Reporter ted cruz and marco rubio clashed over National Security and border control. Cruz accused rubio for supporting a path to citizenship for undocumented immigrants, branding it amnesty. Does ted cruz rule out legalizing people in this country illegally now . Ive never supported legalization, and i do not intend to support legalization. Reporter calling the senators fights irrelevant, Chris Christie said his experience as a post 9 11 u. S. Attorney and new jersey governor makes him best prepared to be commander in chief. States senate. I mean, endless debates about how many angels on the head of a pin for people that have never had to make a consequential decision in an executive position. Reporter after the debate, rand paul said trumps calls to shut down the internet and to target the families of terrorists were radical and ridiculous. I think when people discover he wants to get rid of the First Amendment to the constitution, they might say, oh, my god. Reporter we asked trump what he valued more, security or the bill of rights. Ive always come down on the side of security. To me its the most important. Reporter even if it means doing something to encroach on the bill of rights . I hate it, i hate the concept of it, but we are dealing with some very bad dudes. Reporter trump also ended months of speculation about a possible Third Party Candidacy if he doesnt win the gop nomination. I am totally committed to the republican party. I feel honored to be the frontrunner. Advisers said trump had always been clear he would run as a republican, not consider a third party race. Trump made the announcement tonight after reviewing polling data nationally. He now sees a clear path to the nomination. The city of flint, michigan is in a state of emergency. High levels of lead were found in the tap water. This week, foam fema sent more than 7,000 gallons of bottled water to the city residents. Adriana diaz has a report on how this crisis unfolded. Reporter when officials ta