Ali-A Army is an Icon Series Fortnite Emote from the Ali-A set. Ali-A Army was first added to the game in Fortnite Chapter 3 Season -3.
The Ali-A Army emote can be unlocked by completing the following quest by May 29, 2022:
Eliminate Opponents at the Ali-A Experience in Epic's Picks. 
This can be done on Fortnite Creative Island: 5135-8778-2901
Ali-A Army is part of the Ali-A set! You can find all of the items that belong to it below.