Special Forces Declassified: Green Light Teams and the Green Berets Who Carried Nuclear Weapons

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Did you know U.S. Army Green Berets once trained to infiltrate behind enemy lines carrying nuclear weapons?

In this debut episode of Special Forces Declassified, a new Security Halt! Podcast segment exploring the history, missions, and people of U.S. Army Special Forces, Deny Caballero examines the Cold War’s secretive Green Light teams.

These specially trained Green Berets prepared to infiltrate denied territory and employ Special Atomic Demolition Munitions, or SADMs, against critical targets if the Cold War turned into a conflict with the Soviet Union and Warsaw Pact. The compact nuclear devices could be transported by individual operators, creating one of the most extraordinary mission sets in Special Forces history. 

This episode explores the origins of Green Light, tactical nuclear weapons, Special Forces selection and training, infiltration methods, potential targets, nuclear security procedures, the extraordinary risks operators accepted, and the legacy of a mission that remained secret for decades.

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Chapters:

00:00 The Secret Cold War Stories Nobody Talks About
 01:11 Introducing Special Forces Declassified
 02:12 Declassified History Using Open-Source Intelligence
 03:06 Project Green Light: Green Berets With Nuclear Weapons
 04:20 The B-54 SADM: The Green Beret “Backpack Nuke”
 05:00 Why the U.S. Developed Tactical Nuclear Weapons
 08:25 Atomic Demolition Munitions and Cold War Strategy
 10:00 Inside America’s Smallest Nuclear Weapon
 11:49 What It Took to Train With a Nuclear Device
 13:14 Why U.S. Army Special Forces Got the Mission
 15:07 Green Light Targets: Bridges, Dams and Tunnels
 16:05 The Mission: Stop or Delay a Soviet Advance

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Transcript

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Cold War Story Nobody Tells

SPEAKER_00 0:00

The Cold War is a chapter of our military history that doesn't get talked about much. What it does, it's the same old, same old cloak and dagger stuff, spies, dead drops, and the CIA, of course, Berlin in the fog. But that's fine, it's dandy. But it's worth remembering that while all that was going on, there were some dudes on the ground doing some crazy stuff on behalf of the Special Forces Regiment. Like practicing to infiltrate a hostile nation with a nuke strapped to their bodies. I'm Denny Caballero, Green Beret, History Buff, and this Special Forces declassified. Dropped overlay. Boom. So here's the deal with this segment. Every few weeks, I'm going to sit down with you and dive into some real SF history. Some of it was classified for decades, some of it was never classified. It just never got talked about because the guys who did it went home and didn't talk about it. I'm going to walk you through it the way it gets told in a team room. The mission, the men, the risk, what it says about the regiment. And here's one ground rule. I'm going to say it every time. Everything in these files is open source. It's published, it's public. The guys who did it have talked about it on the record. I'm not leaking anything. It's not my thing. Look, I'm no historian, and I won't be glorifying a bunch of stuff. Just the stuff I find to be really cool that hasn't been talked about much. And today's file is one of those things. Greenlight, a U.S. Army Special Forces program that ran from approximately 1962 to 1989 at Fort Bragg, right on Smoke Bomb Hill. The weapon was a B-54 Special Atomic Demolition Munition, the Satum. Probably heard it called the Backpack Nuke. Alright, let's dive in.

Why Build A Backpack Nuke

SPEAKER_00 1:42

Part one, why would anybody build this thing? To understand why the United States would ever put a nuclear weapon on the back of a green beret, you gotta understand the problem. But the early 60s, both sides had the big stuff. ICBMs, sub-launch missiles, bombers, the US and the Soviets could each wipe the other off the map in about 30 minutes. And that, my friends, created a weird problem. Those weapons were so big they were basically useless. Think about it. The Soviets rolling a tank army through Western Germany? Is the president really going to launch on Moscow over that? Everybody knew the answer was probably no. So big nukes weren't stopped in a conventional invasion, and the Warsaw Pact had a massive edge in Central Europe. Tanks, artillery, manpower. NATO's own planning assumed that in a straight up conventional fight, they lose ground fast. So the Pentagon got to work. They built a middle option. Tactical nukes. Yeah, they did that. Smaller yield, shorter range. Something you use on a battlefield against a military target without kicking off World War III. They built a bunch of them. Nuclear artillery shells, nuclear rockets, a nuclear recoilless rifle called the Davy Crockett. That's a real thing, it's right here. And the range of the Davy Crockett was friggin' short. The crew was inside its own danger zone. Inside that family was a category called atomic demolition munitions, or ADMs. You don't fire these, you carry them to a target, set them, and leave. It's engineering demo. Bridges, dams, tunnels, just with a nuclear charge. So the thing you blow up stays blown up. There was a big one, MADM, which needed a crew and a vehicle. And then there was a small one. And that's the one we're going to talk about because it's not always about size. The small one was called the B 54 SADM. SATM SAD SADMAN SATAM SADM. Here's what's public. It used the W 54 Warhead. It's the same family as the Davy Crockett, the one we talked about earlier. Had a selectable yield, and the reported range is somewhere from about 10 tons of TNT up to around a kiloton. For scale, Hiroshima was about 15 kilotons. So yeah, this was small for a nuke, but it's still a nuke. The whole package weighed somewhere around 50 to 60 pounds, depending on where you're getting the information. Traveled in a container, the one you see in the declassified photos right here, is the H-912 Parachuters Delivery Container. A cylinder about two and a half feet long, a foot and a half across, with a jump harness on it. It was the smallest nuclear weapon the United States ever fielded that one dude could physically carry. It had a mechanical timer, a code lock to arm it, and the code was split between two men, and we'll come back to that piece of info in a minute. As a former 18 Bravo, I have to ask myself, what would have been like to sit down in that training scenario and be issued your training advice to practice on and work on? It just blows my mind that at one point that was a reality. I hope to God they didn't have that in the Bravo course. I'm pretty sure I would have failed that. Moving right along, let's talk about the mission

Who Carried It And Why

SPEAKER_00 5:00

now. So who gets a weapon like this? Now, we know it is part of SF history, but we have to understand that this wasn't given to a regular grunt company, not an engineer battalion. They needed dudes can get deep behind enemy lines on foot, undetected through rough terrain, and have a special ability to carry heavyweight for a really long time. Sounds like special forces. So in 1962, the mission went to SF, and the teams were called Greenlight. It's a pretty cool name. Here's the concept. If the balloon ever went up, if the call was made, if the Warsaw Pact crossed into West Germany, North Koreans came across the DMZ, there wasn't even a plan to go into Iran too. Greenlight teams were already inside, or they were about to be. Their mission would be to get to a specific target and place the nuclear device, arm it, and get out before it goes off. And let me be real clear about something. Because backpack nuke makes people picture something it wasn't. The targets were never people. This was a demo weapon. The target list was infrastructure, bridges, dams, rail yards, tunnels, mountain passes, choke points, to places where if you take them out completely, an armored column has to stop and go find another way. The whole point was to buy time, not to win, to stall a Soviet advance by hours, maybe days, so NATO could get reinforcements moving and get all its air power up. Green light teams were the friction. Two guys in a nuke, thrown into the gears of a tank army. And that, my friends, was the assignment. It wasn't to go win. It was to go be a pain in the butt and slow down the other guy by a day, at whatever cost it takes. This is uniquely SF. This is exactly what Special Forces does. If you look at the UW concept and what Special Forces was built to do, this is 100% in there. The only thing we're not doing is entrusting this into an indigenous partner force. We'll talk about that in a later file someday. But this is deeply tied to the SF mission set. Just has a lot of additional risk. So who gets picked to do this? You had to already be SF. You had to have already gone through selection, already gone through the Q course, and uh more than likely, you had to have already had some team time underneath your belt. And we're not talking about one or two weeks. You probably had to be a senior guy that's already proven himself. But Greenlight was an infiltration problem long before it was anything else. The targets were places you couldn't drive to. So these teams train across everything SF had. Greenlight team members had to be military free fall qualified, combat divers, and expert mountaineers. Because nobody knew when that call was going to come or where they were gonna have to go. But they were gonna have to execute that mission regardless. So they had to stay ready. Mastering these info capabilities is one thing. That's just one aspect of the job. Then there's the technical side of this. You have to understand the arming sequence, the timers, yield settings, and proper placement for this device. You have to actually understand how to utilize it to actually drop a bridge or collapse tunnel. And placing a nuclear device with one shot and no do over is a science. It's a science you better have rehearsed a hundred times. And they did. Public accounts describe full dry runs against real infrastructure inside the United States. Infiltrate, get to the target unseen, and place a training device, exfil. If you could do it on an American dam without getting caught, you could do it to a check one.

Training The Infiltration And Placement

SPEAKER_00 8:40

Now, a two-man rule. This is the heart of the whole thing. American nuclear doctrine says no single person can ever employ a nuclear weapon alone. Not the president, not a bomber pilot, not even a green beret. So green light teams had to at least have two men who could arm the device. And the code was split. Each guy held one half. I want to pause and kind of reflect on that aspect of it. The dependency, the two-man rule, and why that's really important for special forces in the regiment today. It's still a place of high trust, high performers, and understanding that you're nothing without your teammates. It's not about what you can do, it's what both of you can accomplish together. And this two-man rule still happens today, man. It's still something that is part of the military. And within special operations, you train together. No matter what the mission is, no matter what the odds are, as long as you got another GB next to you, you know you can conquer the world. All right. We got to talk about something nobody wants to talk about, and that's the risk. Once you set the timer, you've got a window. Device had a delay built in, so they set it, they got clear, moved to their exfil point, and hopefully they survive. That's a theory, at least. With that theory held up as something the guys who did this job had disagreed about publicly for many years. So I'm going to give you both sides, because both sides were there and I wasn't. Wardcamp says, flat out, it was a one-way mission. Juste off a nuke in enemy territory. Every soldier and every cop for 50 miles is now converging on the spot. You're on foot, maybe even within the fallout, depending on the wind. No vehicle, no aircraft coming for you, and a very long walk through a country that's now at war with yours. Timer gets you out of the blast, it doesn't get you out of the country. But the other camp pushes back. They say the timers were realistic, and that SF trains for exactly this kind of long-range evasion.

The Two Man Rule And Trust

SPEAKER_00 10:40

And plenty of Cold War missions had similar odds without anybody calling them suicide missions. They didn't sign up to die, they signed up to do hard jobs and come home. I'm not going to tell you which side is right, which side is wrong. But here's what's not in dispute. Nobody promised these guys a helicopter X-Fill. The X-Fill plan was evade and escape, walk out, link up with the resistance if there was any, and get to a border. That was the plan. That was the whole plan. And the other thing that's not in dispute, the program was never used. Not once. Not in Europe, not in Korea, not in Iran, nowhere. The devices stayed in storage, the wall came down in 89. Greenlight got closed out the same year, and most of the guys didn't say a word about it for another 10 or 20 years. They were professionals who took on a mission with catastrophic risk because somebody had to do it. And they were the ones most qualified to do it. The fact that they never had to do it doesn't make the risk acceptance smaller. But here's my honest take on it. I think this is a remarkable and absolutely phenomenal piece

One Way Mission Debate

SPEAKER_00 12:02

of special forces history that shouldn't die off. We should understand what our guys are willing to do. Without modern tech, these guys didn't have ATAC, they didn't have Garmin GPS. They're willing to jump in with a nuclear device that had to be mechanically armed and then placed within enemy lines and then beat feet back across the border. That's incredible. That's more incredible than a lot of stuff that happened through the GWAT. Not saying anything bad about our GWAT heroics. I'm just saying to train as a two-man element, to jump in or dive in or mountaineer with a nuclear weapon on your back, pretty insane. And having lived the regiment life, I can only imagine the amount of training and amount of recogs this guy's these guys had to do. So my hat's off to you guys. To make it on the green light team says a lot about who you are and how you excelled in your career. But it says a lot about the regiment as a whole. Every one of those men volunteered, not once, but four times over. Army, airborne, special forces, than this. And the reward for all of that volunteering was a mission with no upside, no recognition, and no ride home. Best case, you walk out of a radioactive crater. Nobody ever knows what you did. That's a DNA of the regiment. It's not the beard, it's not the helmet cam footage, it's not getting featured on OAF. It's not Instagram. It's a guy who takes a job nobody else can do and nobody else wants. Because it matters. We throw a quiet professional around a lot. And here's what it actually looked like. A generation of Green Berets carried a nuclear mission for 27 years. The public didn't find out until most of them were retired. Long before G Want made this regiment a household name for counterterrorism and the Crift Boys with all

Meaning Of The Mission Today

SPEAKER_00 14:00

the rage of OAF. For any of it, it was two dudes and a nuke standing by for a war that never came. And they stood by anyway, because that was a job. Greenlight is just one small chapter in the broader special forces regiment's history. But it's incredible. And I encourage you all to read more about this. Find some new sources. If you know somebody that served on a Greenlight team, send them my way. Ask them about it. Sit down, talk to them. Just because they never had to execute the mission doesn't mean they don't have great stories to tell. All right. Let's bring it on home. Greenlight was a mission with no exit strategy. Literally. The Exo plan was figure it out. Those dudes trained for it anyway, for years, because the mission mattered more than the exit. Most of us walking around today have a mission that does have an exit. A business you want to start, a degree you keep not finishing, a conversation you keep not having. The second act you keep telling people is coming, and then you're stalled. Because it's impossible, because the risk feels too big. But understand this: the thing you're afraid of is real. It's also on the scale of what men have accepted, it's being small. And the wiring to let those men accept green light is in you. If you've served, it's in you, honestly. If you didn't, it's in you as well, you just have to remember you have it. In a way, all of us have a green light mission. That daunting task, that mission that seems impossible, with no clear strategy how to complete it.

Your Own Greenlight Mission Plus Sponsor

SPEAKER_00 15:32

And now a plug for one of my sponsors, Warrior Rising. If your new green light mission is becoming an entrepreneur or launching a new business, and you're not quite sure how to do that, Warrior Rising can help you. Head on over to Warriorising.org, join Warrior University, and start your pathway to business ownership today. Don't wait anymore. Or reach out, slide in my DMs, and I can walk you through the application process. All right, that's it. That's the file. That's what I got for today. If you know somebody that was a green light team member, and some of you might, send them my way. I want to know more about these missions. I want to know more about the training these guys did, and like to give them a platform. And that's it for this edition of Special Forces Declassified. We'll open the next one soon. Next up, a recon team, a jungle, and a radio call that meant every aircraft in theater was about to turn towards you. And they called it Prairie Fire. Alright, guys. Until next time, take care of each other, and we'll see you here. Bye bye.