In which ground security orbit regime are Navigation and NUDET detection typically flown?

• A. Reconnaissance, weather
• B. Navigation, NUDET detection
• C. Reconnaissance, weather, communications
• D. Reconnaissance, weather, missile warning

Answer: (B)

The main idea is that a ground security orbit regime is defined by assets that keep national security informed with global, timely data. Navigation provides continuous, precise positioning and timing for all operations, while NUDET detection offers worldwide early warning of nuclear detonations. Together, they form a security-focused capability set that relies on global coverage and rapid data delivery, which is why this regime typically includes both Navigation and NUDET detection. Other options mix in reconnaissance, weather, communications, or missile warning capabilities, which belong to different mission-focused regimes and don’t align as cleanly with the security-centric pairing of navigation and NUDET.