I Really Can't Fly a Mecha

When space carriers eliminate aircraft carriers, heavy mechas replace main battle tanks, and high-level energy replaces oil. A dilapidated and silent alien base, a dark and cold space fortress, an unknown planet where bloodthirsty creatures are rampant... Humanity has gone into deep space. PS. Invincible article, not a stallion, not a harem, please collect it and vote for it.