Which aircraft serves as the Navy's communication relay for fleet ballistic missile submarines?

The Navy's communication relay for fleet ballistic missile submarines is the E-6A Mercury. This aircraft is specially designed to provide command and control capabilities, which are essential for the strategic communication needs of the Navy's submarine fleet. The E-6A serves as an airborne platform that can relay communications between submarines and command authorities on the surface. It plays a critical role in maintaining the chain of command and ensuring that submarines can receive and act on orders, especially in scenarios involving nuclear deterrence.

The other aircraft mentioned do not fulfill this specific role. For instance, the E-2 Hawkeye is primarily an airborne early warning and control aircraft that focuses on surveillance and targeting, while the P-8 Poseidon is geared toward anti-submarine warfare and maritime reconnaissance. The C-2 Greyhound is designed for logistics and transport, serving as a carrier onboard delivery vehicle, rather than as a communication relay.