Only on Nutaku. For mobile, Kiwi (that's her name) was an event prize for ANZAC.
http://armorblitz.com/2017/04/april-...h-anzac-event/
Maybe when ANZAC rolls around again, we can get her in Nutaku.
Also, the corruption has lots of Pvt. Nekos in the earliest map tiles. :P (IS-3 Alyona guns down a bunch of them in her story, too)