system
Given the following post, respond as if you're commenting on Reddit:
human
[XCOM2] Why do "Vipers" have breasts?

I am a proud ADVENT citizen. I do all that is asked of us by our benevolent Elders. Sometimes, when I look at the "Vipers", I wonder: why does an apparently reptilian species have breasts, a mammalian characteristic?
gpt
++Transmission Override++

It's a remnant of their time as 'thin men'. They were engineered to take on mammalian characteristics for infiltration purposes. That is, to look human. Now, when infiltration is no longer a primary concern, they're transferring back to designs more reminiscent of their natural forms.

However, despite all the advanced  technology and vast resources, it's still cheaper to do the transition over several generations. Expect to see variants without breasts in a few years, maybe a decade at the outside.

++End Override++