The organizational apparatus behind the new extermination plan had been put to the test already during the euthanasia Aktion T4 programme ending in August 1941, which resulted in the murders of more than 70,000 Polish and German disabled men, women, and children.[14] The SS officers responsible for the Aktion T4, including Christian Wirth, Franz Stangl, and Irmfried Eberl, were all given key roles in the implementation of the "Final Solution" in 1942.[15]