For secure voice communications, which radio is used?

The SINCGARS (Single Channel Ground and Airborne Radio System) is the correct choice for secure voice communications. This tactical radio system is widely utilized by U.S. and allied forces for its ability to provide secure, jam-resistant voice and data communications.

SINCGARS is designed to operate in the VHF spectrum and supports frequency hopping, which makes it difficult for adversaries to intercept communications. This feature is crucial for maintaining operational security, especially in combat environments where secure communications are vital for coordination and command effectiveness.

The other options do not serve the primary function of secure voice communication like SINCGARS does. For instance, AMDWS primarily serves as a battle management tool, EPLRS is used for data communications and positioning, and JTIDS (Joint Tactical Information Distribution System) focuses on providing secure data link for tactical information exchange, rather than secure voice communications. Thus, SINCGARS stands out for its dedicated capability to secure voice communication.