Einsatzkommando members shooting at Jews in a field in Dubossary, Moldavia. The weapons are Mauser guns. 14th of September, 1941. Dubossary, Moldavia, USSR. Photographer unidentified.  © USHMM, Imperial War Museum. Crown copyright. All rights reserved

Einsatzkommando

Members of an Einsatzkommando firing at a group of men standing at the bottom of a trench. Circa : 1941-1942. Whereabouts unknown. Photographer unknown.
© USHMM, courtesy of Dokumentatioarchiv of the Oesterreichischen Widerstandes

Einsatzgruppen

I believe someone was referring to this photo earlier today (maybe on another thread).  Found at http://www.aeronautics.ru/archive/wwii/baltic_nazis/latvia/contact.htm
Description:  Such was the scale of the German slaughter in Russia that the German command was hard-pressed to find the most efficient form of extermination, particularly with respect to the Jews. Some German commanders disliked the inhumanity of hanging. The preferred method of the Einsatzgruppen, the SS extermination squads, was to round up all Jews and shoot them out of hand. Here, a "standard" execution is watched by a youth (centre), a member of the Nazi youth labour organization. (Source: "The Eastern Front in Photographs", by John Erickson)