The USMC will never die.
On their way to rescue a science station on Europa, the ship is destroyed and a small group of Marines are hurled into deep space while in stasis.
Hundreds of years later they are discovered by the Socialist Organizational Governance.
What their SOG captors don’t know is the Marines are equipped with now outlawed implanted AI that boost their reflexes and combat capabilities.
The Marines escape as the science base suffers a disaster and the Marines meet the Aesir, a group of near immortal warriors fighting SOG.
Let the bodies hit the floor.