Girlfriends grandfather is in this photo taken decades ago. Eastern Europe is most likely the region. We don't know much about him. Wondering if anyone can identify the uniforms and help us figure out where this might have been taken?

I doubt this is from Eastern Europe: that's very clearly British Battledress, and I lean towards Royal Artillery for the corps owing to the shape of the cap badge and the white lanyards. The badges above their stripes could also be that of a Master Gunner. The man third from the right in the back row also wears his badge on the lower sleeve, which is a distinction peculiar to British Army Warrant Officers. I would suggest that this is a Warrant Officers' and Sergeants' Mess photograph.

If your girlfriend's grandfather was from Eastern Europe, however, if he was Polish then it is quite possible that he was a member of the Mixed Service Organisation. The MSO was a civilian auxiliary of the post-war British Army of the Rhine, initially established to guard Displaced Persons camps, but ultimately expanded to include labourers, dog handlers, and a transport service. With the occupation of Poland by the Soviet Union in 1945, many of the two-and-a-half million Poles liberated from German concentration camps proved unwilling to return to a country where they were now regarded as politically-suspect, and remained behind to assist the British army of occupation in Germany. Many of the Royal Army Service Corps' transport squadrons in fact began life as Polish-manned MSO units before British troops replaced them, and until the 1990s, many British tank transporter operators would receive their first instruction on the vehicle from a Pole. In fact, the current 7 Regiment of the Royal Logistic Corps carries the White Eagle of Poland as its regimental insignia, in memory of the time of its heritage as 7 Tank Transporter Regiment and British Army tank transporting's connection to Poland.