Final answer:
The AN/VRC-90F is a military vehicular radio system, known for secure, reliable communication and is part of the SINCGARS family.
Step-by-step explanation:
The AN/VRC-90F is a type of vehicular radio system used by the military. This system is specifically designed for secure and reliable communication over long distances and is known for its robustness in various environmental conditions. Being part of the SINCGARS (Single Channel Ground and Airborne Radio System) family, it is capable of frequency hopping and encryption to ensure secure communications. These features make it vital for operational coordination among troops in various scenarios and can be mounted on a variety of military vehicles.