Whether MSA are real stories is not straightforward. Sometimes they draw inspiration from real life, but are embellished or fictionalized to make them more engaging or to fit a certain narrative.
Well, it's hard to say for sure. Some MSA stories could be real, reflecting actual happenings or people's true accounts. But there's also a possibility that they're made up to captivate the audience and take them on a fictional journey.
Marcus Luttrell is a Navy SEAL. He is the central figure in his own story. He was part of a special operations mission and became the sole survivor of a tragic event during that mission.
MSA is typically not based on true stories. It's more about creativity and constructing fictional plots and characters to entertain the readers/viewers. However, some elements might draw inspiration from real-life situations but in a very indirect way.