Guinea Pigs Wanted! is a Basic Mission in Xenoblade Chronicles X. It is a request from Alexa at the Outfitters Test Hangar in the Industrial District and the primary destination is New Los Angeles. This mission must be accepted in order to start the affinity mission Weaponized.
"You accepted Alexa's request."
In Japan this mission requires purchase and installation of the Alexa DLC pack. In other countries this content is built into the game, and does not require an additional download or purchase.