Which of these roles is NOT one of the six Under Secretaries of Defense who assist the Secretary of Defense?

The role that is NOT one of the six Under Secretaries of Defense who assist the Secretary of Defense is Requisition. The Under Secretaries of Defense have specific responsibilities that align with various facets of national defense and military operations.

Acquisition, Intelligence, and Comptroller are indeed categorized roles. The Under Secretary of Defense for Acquisition and Sustainment focuses on procurement and management of military acquisitions. The Under Secretary for Intelligence oversees intelligence operations and policies. The Comptroller's role involves budgetary functions and fiscal management concerning defense expenditures.

In contrast, the term Requisition does not correspond to an official Under Secretary position within the Department of Defense. While requisitions may play a role in procurement processes, this term does not designate a role or position at the Under Secretary level. Understanding the specific titles and responsibilities of these positions helps clarify how the broader organizational structure of the Department of Defense operates.