system
Given the following post, respond as if you're commenting on Reddit:
human
[Alien] The Weyland-Yutani Corporation finally captured a queen. Now what?

How do they go from "uncontrollable, perfect killer" to "reliable weapon"?
gpt
They might be better off trying to isolate certain aspects of the xenomorph's unique biology, rather than using the xenomorphs themselves as weapons. 

Their blood is an unaccountably powerful acid, which itself is contained within their bodies somehow, so their bodies must have some amazing ability to resist acids. Their reproductive cycle allows them to play with completely unrelated species' DNA like Legos. They can survive in a wide range of profoundly hostile environments. Their metabolisms are somehow configured such that a creature the size of a kitten can grow to over six feet tall in a matter of hours apparently without feeding. They are possibly psychic.

Even if one assumes that the xenomorphs themselves are unsuitable as weapons (which is a huge "if" in the face of WT's suicidal incompetence), any one of those particular qualities would make the xenomorph a gold mine of research for a wide number of applications. Securing a queen would be the foundation of such research.