Each group usually consisted of three to four squadrons ("Staffeln"), which were identified using numbers; e.g. 3./JG 1. Each squadron also had a subordinate headquarters flight ("Stabschwarm") associated with it. A squadron with an establishment of 12–16 aircraft usually consisted of three to four flights ("Schwärme") of four aircraft usually flying in the "finger-four" formation. The commanding officer of a squadron ("Staffelkapitän") usually held a rank of senior lieutenant ("Oberleutnant") or captain ("Hauptmann"). The flights of a squadron were color-coded "Red","Blue","Yellow" and "Green".