What is the Navy's strategic airborne command post?

The Navy's strategic airborne command post is the E-6B Mercury. This aircraft is designed to provide command, control, and communications capabilities for fleet command and is particularly focused on ensuring the continuity of command in the event of a nuclear strike. The E-6B serves a crucial role in maintaining the ability to communicate with submarine-launched ballistic missiles, as it is equipped to handle and relay vital information to strategic forces.

Other aircraft listed, such as the C-2A Greyhound, primarily serve logistical roles, transporting personnel and supplies to and from aircraft carriers. The P-8 Poseidon is utilized mainly for anti-submarine warfare and intelligence, surveillance, and reconnaissance missions, rather than serving as a command post. The T-45A Goshawk is a training jet designed for training naval aviators and is not involved in command and control operations. Thus, the E-6B Mercury's specific capabilities align with the purpose of a strategic airborne command post, making it the correct choice.