Which of the following is NOT one of the six elements of Naval Doctrine?

The six elements of Naval Doctrine are essential concepts that guide the employment of naval forces and shape the overall strategic approach of naval operations. Warfare, Logistics, Operations, and other related elements directly align with the primary functions and operational capabilities of naval forces.

Research and Development, while important for technological advancements and improving tactics and equipment, is not classified as one of the core elements of Naval Doctrine itself. Instead, it is more of a supporting function that enables the naval forces to achieve superiority in warfare and enhance logistical capabilities. By understanding the Navy's strategic framework, one can better appreciate how these elements interrelate, but it's clear that Research and Development does not fit into the primary categories outlined within the official doctrine.