[Dreadnought Mech] and [Strike Cruiser] are both part of Star Warrior Technology.
The reason for this is that these two technologies are essentially only seen within the Starfighter Battle Groups.
Let's start with the Dreadnought Mech; it's a type of Mecha exclusive to Interstellar Warriors, but not everyone can use it.
Interstellar Warriors are incredibly strong, but they are not immune to injury or death. When a comrade is so severely injured that no amount of conventional medical treatment can restore their combat abilities, a typical Battle Group has two options: donate their Gene Seed and receive the peace bestowed by The Emperor, or enter a stone sarcophagus with a life support system, fusing their nerves with machinery to become a Dreadnought Mech.