However, a small number of Allied personnel were sent to concentration camps, for a variety of reasons including being Jewish. As the US historian Joseph Robert White put it: "An important exception ... is the sub-camp for U.S. POWs at Berga an der Elster, officially called "Arbeitskommando 625" known as "Stalag IX-B". Berga was the deadliest work detachment for American captives in Germany. 73 men who participated, or 21 percent of the detachment, perished in two months. 80 of the 350 POWs were Jews." Another well-known example was a group of 168 Australian, British, Canadian, New Zealand and US aviators who were held for two months at Buchenwald concentration camp; two of the POWs died at Buchenwald. Two possible reasons have been suggested for this incident: German authorities wanted to make an example of "Terrorflieger" ("terrorist aviators") or these aircrews were classified as spies, because they had been disguised as civilians or enemy soldiers when they were apprehended.