The Darkside War, Volume 1

"There are many aliens out there. They come in all sorts of shapes and sizes. You will probably fight [beside] creatures that will haunt your nightmares long after you leave the service, and they're the good guys. However, if you want to survive your first encounter with the enemy there are five aliens that you need to learn to spot on sight. Pay attention now and you might live to see your mama again someday"--