507th joint fighter wing
The 507th Joint Fighter Wing is a volunteer group previously called the Suomus Independent Volunteer Aerial Squadron. To many, they bear the nickname "Silent Witches" or, less flatteringly, the "Suomus Misfit Squadron" in reference to the reputation of some squad members. As per the name, it is stationed in Suomus. They are the subject of the popular 'Suomus Misfits" light novels.
The tag should ideally refer to most (5+) of the squadron together.
Members:
Anabuki Tomoko
Elizabeth F. Beurling
Elma Leivonen
Giuseppina Cenni
Katharine O'Hare
Ursula Hartmann
Sakomizu Haruka
Source: Strike Witches Wiki