It’s just more localized subsets of the Garrison. I honestly voted against their creation last year because it seems silly to further break down such a small group of people. You can ignore the “squad” designation if you want or you can participate in collecting extra patches and stickers with the various logos. There’s some extra emails from squad leaders, maybe a group chat, but it doesn’t really change the way the Garrison operates. All event planning/recording is still done on this website with not real mention of squads in official reports.
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