Question: Who helped Hans-Ulrich von Oertzen develop Operation Valkyrie?
Sentence (from "Operation Valkyrie"): Operation Valkyrie (German: "Unternehmen Walküre" ) was a German World War II emergency continuity of government operations plan issued to the Territorial Reserve Army of Germany to execute and implement in case of a general breakdown in civil order of the nation.
Relevant evidence: Yes