Bundesadler ("federal eagle") patch. Worn by all Austrian troops (in Austria and usually on left side)
Unit patches (worn on right side):
Panzerbatallion 14 ("armored battalion 14")
Panzerbatallion 14 2. Kompanie (2nd company)
Panzerbatallion 14 3. Kompanie (3rd company)
Panzergrenadierbatallion 13 ("mechanised infantry battalion 13")
That's all what I have so far. I don't really collect them because they're way too expensive. On ebay they're up to about 20$. In the army we paid just 2€ each or sometimes got them for free! Above you see the patches of my units in basic military service and the last two I got from a friend. He used to be in that unit.