verst.Aufk.Aus.Schw./Aufkl.Ers.u.Ausb.Abt.15 EKM

The tag or 'Erkennungsmarke' shows signs of wear. The abteilung was formed in August 1939 as Kavallerie-Ersatz-Abteilung 15 and was part of Division 166. It trained and supplied soldiers for different Aufklärungs-Abteilungen, Radfahr-Schwadronen, Schnelle Abteilungen and Kavallerie/Reiter-Regimenter.
In October 1942 the abteilung was renamed in to Radfahr Ersatz Abteilung 15 and in April 1943 into Aufklärungs Ersatz Abteilung 15. 
The Aufklärungs Ersatz und Ausbildungs Abteilung 15 must have been formed later in the war. However no information can be found on this matter. The verstarktes Aufklarungs Ausbildungs Schwadron was part of Aufklärungs Ersatz und Ausbildungs Abteilung 15.

In late Februari 1945 the abteilung, together with other units where put into action in Raum Krommert-Wesel-Borken-Bocholt. The remaining of the war it fought many hard battle against the British and Americans. 
Interesting and not so common tag.