That is the symbol for the 12th SS Division "Hitlerjugund".

They were a particularly infamous unit of the Waffen-SS, raised in 1943 with the intent being to man the unit with members of the Hitler Youth (Officers and NCOs were drawn from veterans of existing units however). As such, the average soldier was usually just an 18 or 19 year old. They saw action on the Western Front, having been deployed to France, and as I said, gained an infamous reputation, principally for a string of executions carried out against Canadian POWs in the first few days of the Battle of Normandy. They suffered major losses in the first few months of combat, but would continue to fight on the Western Front with only a few breaks and poor quality reinforcements through the end of the Battle of the Bulge, after which they were transferred to the East, seeing action against the Soviets.

Kurt "Panzer" Meyer, a regimental commander and later commander of the division before his capture in September, would stand trial for the killings after the war, and be convicted by the Canadians. Originally sentenced to death, his sentence was commuted to life imprisonment, and would end up serving only ten, being released in 1954. He went on to be an apologist for the conduct of the Waffen-SS, writing an interesting yet disturbing memoir called "Grenadiers" and spokesman for HIAG, an organization committed to whitewashing the Waffen-SS's record.