The Ministers and Chiefs of the Defence Staff are supported by a number of civilian, scientific and professional military advisors. The Permanent Under-Secretary of State for Defence (generally known as the <answer>Permanent Secretary</answer>) is the senior civil servant at the MoD. His or her role is to ensure the MoD operates effectively as a department of the government.
What is the Permanent Under-Secretary of State for Defence generally known as?
Permanent Secretary