Hello, I am new to this site to try and gather some information on some pen and ink drawings that I have. I have tried to research them but have been unable to find any information. I have tried to find the uniform types of the subjects but cannot find the sleeve cuffs. A couple of them are signed R.W. and one of them is titled "OBERST KOMMANDANT BIBERSTEIN". It even seems to me that Oberst Kommandant may not even be an official title. Any help that anyone out there may be able to provide would be very gratefully received. Thank you in advance.