Flying Regiment 19, Finnish Air Force

Flight Regiment 19 (Swedish: Flygflottilj 19, Finnish: Lentorykmentti 19 or LentoR 19), known in Sweden as the Swedish Volunteer Air Wing in Finland (Svenska frivilligflottiljen i Finland) or F 19 Finland was a Finnish Air Force unit, manned by Swedish volunteers, which operated from Kemi in northern Finland for the last 62 days of the Winter War, and equipped with aircraft from the inventory of the Swedish Air Force. Its designation number was taken from the Swedish Air Force, which had 18 Air Force Wings at the time.

Source: Wikipedia — Flying Regiment 19, Finnish Air Force (CC BY-SA 4.0)