Thanks for the additional information, j.n. (
), but it's still not enough to be reasonably certain. Nevertheless, I'll take a shot and here is what I think "ASC" or "asc" means in this context with KG 26: aircraft servicing companies. By November 1944, all of the Flughafenbetriebskompanien or FBKs (Airfield Servicing Companies) had been reorganized as Flugzeugwartungskompanien or FWKs (Aircraft Servicing Companies). At the start of the war, each Kampfgruppe had 2 FBKs but by 1944 this had been reduced to one FWK per Kampfgruppe. So KG 26 having 3 of these fits.
L.