Here are some pictures. There are some pins that came with it. http://imgur.com/a/DGIsx
this is what I could find: link
Summary:
They were a Czechoslovakian "road battalion." Engineers that build bridges and roads. From the pictures, they are military. There are photos of pontoon bridges, tanks, etc.
The article has some pictures and mentions the battalion was in two places: Ružomberok, Slovakia. Small town.
Also Znojmo. A southern Moravian town that goes way back.
Anywho, so the big medal in your picture says "15 years" (15 let), so it's a 15 commemorative medal of that VÚ-8927 from the town of Hodonìn, a military engineer "road battalion".
The medal's text on the top says VŪ-8027 HODONÌN