Swedish Occupation: Adelsbussar
From FamilySearch Wiki
A soldier of lower rank and less pay than a non-commissioned officer but with higher pay than the enlisted soldier.Often a young nobleman, who joined the army as a volunteer.
References
Andersson, Kent and Anderö, Henrik. Ordbok för Släktforskare, ICA bokförlag, Forma Publishing Group AB, Västerås, 2006