system
Given the following post, respond as if you're commenting on Reddit:
human
[Aliens] What else do the Colonial Marines do? Are there other less dangerous aliens they kill?

Obvs theres still plenty of human conflict for them to be so well equipped, but during the briefing Hudson (i think) asks if the mission is "another bug hunt", and their first dropship thats destroyed had "Bug Squasher" painted on the side. 

However its obvious the Xenomorphs are something theyve never seen before, but is there some other chitinous extraterrestrial species they routinely and more easily have to exterminate more out of annoyance than potential extinction? Something maybe in between Martian Buggalo and Klendathu Arachnids? Something... uh young... Predators cut their teeth on before Xenos and Humans?
gpt
One thing to keep in mind is that "xenomorph" is *not* the name of the Aliens' species. When Lieutenant Gorman says that "a xenomorph may be involved," in the movie *Aliens,* he is not referring to a specific type of creature. He is using a fancy five dollar word which just means "alien," but he doesn't actually know what specific creatures they are dealing with.

So to me, that means that, yes, the marines are somewhat used to dealing with alien life, or at least aware of the possibility that it may happen, and they are used to dealing with other *xenomorphs,* although not the specific ones they encounter in the films.