Final answer:
The statement is false. 'Sea Power 21' relates to modernizing the United States Navy as a whole, not specifically to Navy Medicine, whose mission is to deliver high-quality healthcare.
Step-by-step explanation:
The statement that Sea Power 21 is Navy Medicine's primary mission and the basis for optimizing and transforming Navy Medicine is false. Sea Power 21 is a concept developed by the United States Navy to modernize and orient its naval forces for the 21st century.
It aims at integrating the Navy's capabilities to enhance their effectiveness in joint operations, but it is not specifically tied to Navy Medicine.
Navy Medicine's mission, however, is to provide high-quality medical care to all assigned military personnel, support their families, and also care for veterans and survivors. Navy Medicine focuses on readiness and health for naval service members.