The last member of Delta one is reported KIA after an extreme firefight with a rebellion army.

However, the last member of Delta squad is alive, but in a different world. Soon enough, he discovers that this world is ruled by Anthro ponies. He has no problem with that, the problem is that humans are nothing but animals, sex slaves, used for test, and enslaved by the ponies. He has now made it his duty to free humanity from their chains, and bring down the world of ponies, and raise humanity to the top.