Ah... the Allies liberated many concentration camps. The Soviet Union forces liberated those that where East of the River Elbe, and British, Canadian and America forces liberated those West of the River Elbe. The camps that where to the north in Holland where all done by Canadian forces following D-day. British had Belgium. The yanks had the misfortune of dealing with those in southwestern Germany, like Daqchau and Dora. Western Aliies also liberated a camp in Italy while the Soviets liberated all in the Eastern European nations.
So to see Max here being rescued by solders wearing the uniforms that the yanks wore is very likely to be anywhere in the Italian or Western European theatres of war.
Maybe not in Poland but there were other countries which had both death camps and concentration camps (different things). Americans and UK forces were present in liberating multiple camps, and could be poor Max was present in one of those.
I'd say Moody Ferret had a good idea of what s/he was doing here. Very touching picture. ^^