Which system provides narrowband UHF SATCOM for worldwide mobile users?

• A. MUOS
• B. AEHF
• C. MILSTAR
• D. GBS

Answer: (A)

MUOS is the system designed to provide narrowband UHF SATCOM for worldwide mobile users. It delivers secure, two-way communications over UHF with a modern waveform that supports many simultaneous terminals across the globe, while remaining compatible with legacy MILSTAR gear. This makes it ideal for mobile units that need reliable, globally available access to narrowband data and voice, even in contested environments. The other options don’t fit because AEHF operates in higher-frequency bands (SHF/EHF) and focuses on protected, high-priority links rather than narrowband UHF for mobile users; MILSTAR is the older UHF system that MUOS is replacing to support global mobile access; and GBS is a one-way broadcast service, not the two-way, mobile-focused narrowband SATCOM described here.