Does Anyone Remember These Milts?

I need your help all, I have reviewed my copy of my class roster for 1980, and I have 3 names of milts that are not in our grad class photos, does anyone remember them, or when they graduated, or anything about them?

They are:
John W. Cardacin
Norman Johns
Timothy M. Stefanovic

I would like to get this corrected, and am looking for any help that anyone may want to give. Thank you for taking time out to help

Tom C.