On August 10, 1984, Red Dawn stormed into theaters. The Cold War-era film envisioned a WWIII-like scenario of what it would look like if Communist Soviets and Cubans invaded a small Colorado town, and what might happen if a group of teenagers fought back with heavy artillery. The cast included then-unknowns Jennifer Grey, Lea Thompson, and Charlie Sheen, plus rising stars Patrick Swayze and C. Thomas Howell (who had co-starred in 1983’s The Outsiders), plus veteran actors Powers Boothe and Harry Dean “Avenge Me!” Stanton.

John Milius, who had been nominated for an Oscar for co-writing Apocalypse Now and who had co-written and directed 1982’s Conan the Barbarian, directed Red Dawn from a script—originally named Ten Soldiers—written by future Waterworld director Kevin Reynolds. With a budget of $17 million, the film—the first to be distributed with the newly formed PG-13 rating—grossed $38.3 million. Here are some things you might not know about Red Dawn.

1. John Milius rewrote the script of Red Dawn.

Kevin Reynolds wrote Red Dawn while still a student at USC film school. MGM optioned the script and asked Milius to direct it. “I brought the writer in and said, ‘This isn’t going to be easy for you to take because, you know, you’re kind of full of yourself, but I’m going to take this and I’m going to make it into my movie, and you’re just going to have to sit back and watch, and it may not be too pleasant,” Milius told Creative Screenwriting. “My advice is to take the money you have and spend it on a young girl. Enjoy getting laid and write another script. Because this isn’t going to be fun to watch.’”

Milius said Reynolds’s script was similar to Lord of the Flies. “I kept some of that, but my script was about the resistance. And my script was tinged by the time, too. We made it really outrageous, infinitely more outrageous than his vision. And to this day, it holds up, because people ask, ‘What’s that movie about?’ And I say that movie’s not about the Russians; it’s about the federal government.”

2. Milus had a very unique way of auditioning actresses for the film.

Red Dawn co-casting director Jane Jenkins explained that Milius would ask each auditioning actress “What would happen if you were in the wilderness and you were starving? Could you kill a bunny?” “And he’d always say a bunny, not a rabbit,” Jenkins said. “And he’d say, ‘Could you kill a bunny and skin it, and eat it?’ And the girls were horrified at that suggestion, and needless to say didn’t go any further. The girls who said, ‘Well, if it were life or death …’ got to go on and read for the parts they eventually were going to play.”

3. Red Dawn was described as "the most violent movie ever made."

After the movie was released in 1984, The National Coalition on Television Violence deemed Red Dawn “the most violent movie ever made.” They said it contained 134 acts of violence an hour, and they rated it X. “This summer’s releases are the most violent in the history of the industry, averaging 28.5 violent acts an hour,” the Coalition said. They also gave X ratings to Gremlins and Indiana Jones and the Temple of Doom.

4. Milius put Patrick Swayze in charge of Red Dawn's cast.

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Because Patrick Swayze was older than most of the actors, and because he had more acting experience than them, Milius trusted Swayze to control his co-stars. “Milius is a very intense director,” Swayze said in the Red Dawn commentary. “He’s a very wonderful director, but we had to call him the General and he called me, he says, ‘Swayze, you’re my lieutenant of the art. I’m directing these little suckers through you.’ He put a lot of responsibility on my shoulders, and I took it really seriously.”

5. The U.S. military named an operation after Red Dawn.

In 2003, when U.S. troops invaded Iraq, Army Capt. Geoffrey McMurray named the mission Operation Red Dawn. “Operation Red Dawn was so fitting because it was a patriotic, pro-American movie,” McMurray told USA Today. A commander in the 1st Brigade, 4th Infantry Division had already named the target farmhouses Wolverine 1 and Wolverine 2, so McMurray said the name made sense.

6. Milius knew Hollywood would "condemn" him for making the film.

“I knew that Hollywood would condemn me for it,” Milius said in the Red Dawn commentary. “That I’d be regarded as a right wing warmonger from then on, uncontrollable and un-housebroken.” Milius supposedly left one of his guns on his desk while journalists interviewed him, so he demonstrated his ideals well.

“I was the only person in Hollywood who would dare do this movie,” he said. “Hollywood was very left-wing. But I have a lot of contractions. I’m a militarist and an extreme patriot at times, so I believe in all of that rugged individualism hogwash.”

7. Patrick Swayze and Jennifer Grey did not get along.

Not all the actors were thrilled with Milius's decision to put Swayze in charge of the cast. Swayze told Daily Mail that he butted heads with Jennifer Grey in particular, who disliked how he ordered her around. “At the end of Red Dawn, however, when we shot her character’s death scene, she seemed to warm to me,” he said. “It's a tender scene and, as I stroked her hair, it was truly emotional. I think it endeared me to her, and it was clear she and I had chemistry together.” Almost exactly three years later, the pair’s chemistry would ignite the dance floor in Dirty Dancing.

8. Patrick Swayze got frostbite.

Filming in Las Vegas, New Mexico, sometimes meant extremely cold conditions. So cold, in fact, that Swayze ended up with frostbite. “I got frostbite so bad in my hands and my toes, that now if my hands and fingers get the slightest bit cold it feels like someone’s shoving toothpicks under my fingernails,” he said in the Red Dawn commentary.

C. Thomas Howell had a different perspective on the cold temperatures. “You know it’s cold when you’re forced to spoon Charlie Sheen,” he said. “That’s what we were forced to do: to huddle together and pretend we liked each other.”

9. William Smith frightened Charlie Sheen.

William Smith played the Russian Colonel Strelnikov, but in real life he had been a Russian Intercept Interrogator for the CIA. “He was terrifying,” Sheen said in the Red Dawn commentary. “I don’t know if he was in character the whole time, but you couldn’t talk to him on the set. You just kept your distance. But it worked in the movie—look how brilliant he is in the film. He’s an imposing force.”

10. Milius thought Red Dawn was a "zombie movie with Russians."

In the ‘80s, the Cold War was in full swing, and the world lived in fear of a nuclear attack. (Not totally unlike today.) “Red Dawn the film was about the impending possible reality, which at that time was an actual fear of the Soviet Union invading this country,” Milius told Mandatory. “People actually thought that way. That’s why I made that movie, that’s why people liked it. The fear was real and it played on that. That’s what made it an exciting movie.”

Milius compared the film to Close Encounters of the Third Kind. “In this case, I made a movie of the same vein but with Russians. It’s like a zombie movie with Russians. That’s what it was like at the time. People were paranoid about aliens and people were paranoid about Russians. It was Close Encounters with Cold War Russians.”

11. The studio cut a love scene between Lea Thompson and Powers Boothe.

In the Red Dawn commentary, Thompson described a “beautiful love scene” between her and co-star Powers Boothe, who was 13 years older than her. “I say, ‘I’m going to die before having made love. Will you please make love with me?’ We said okay, and disappeared out of frame. And they took the scene out of the movie, which was sad because it explained my character. It was a nice scene.”

12. Fans still yell "Wolverines!" at C. Thomas Howell.

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One of the most iconic lines in the movie comes from C. Thomas Howell’s character, Robert. From a mountaintop he shouts “Wolverines!” which is the name the guerilla group gives themselves. It’s also the name of their high school mascot.

“I get that about twice a week in real life,” Howell told USA Today in 2012. “And about 40 times a day through Twitter.” He said in real life he doesn’t shout back, “but on Twitter, I cannot help typing a ‘Wolverine’ with a few exclamation points on it.”