In December of 2006, a former United States Army Intelligence officer donated photographs of German SS officers in the notorious Auschwitz he had found more than 60 years ago while serving in Germany.

As Ms. Erbelding and other archivists reviewed the album, they realized they had a scrapbook of sorts of the lives of Auschwitz’s senior SS officers that was maintained by Karl Höcker, the adjutant to the camp commandant. Rather than showing the men performing their death camp duties, the photos depicted, among other things, a horde of SS men singing cheerily to the accompaniment of an accordionist, Höcker lighting the camp’s Christmas tree, a cadre of young SS women frolicking and officers relaxing, some with tunics shed, for a smoking break.