True or False: Only half of the Navy's submarine force is entirely nuclear.

The statement is false because the entirety of the current Navy's submarine force, known as the United States Submarine Force, is comprised entirely of nuclear-powered submarines. The Navy has transitioned away from conventionally powered submarines and now only operates nuclear-powered submarines, which provide advantages such as greater endurance and the ability to operate at high speeds for extended periods without the need to surface. This capability makes nuclear submarines essential for the strategic and tactical operations of the Navy.

Historically, the Navy did operate diesel-electric submarines, but that has changed as all active duty submarines are now nuclear-powered. This change reflects advancements in technology and the strategic shift in naval warfare, ensuring all submarines have the advantages that nuclear power provides.