Which of the following radios is a man-pack portable radio employed for long-range, single channel UHF satellite communication?

The AN/PSC-5D is specifically designed for use as a man-pack portable radio that facilitates long-range single channel UHF satellite communications. This radio has capabilities that allow it to operate effectively in diverse environments for military operations, providing essential communication links over vast distances.

The features of the AN/PSC-5D include its portability, which enhances the mobility of personnel on the ground while ensuring they maintain reliable communication through satellite links. This is crucial for tactical operations where mobility and communication are key.

In contrast, the other options listed—AN/PRC-150, AN/PRC-117G, and AN/ARC-210—while similarly associated with military communications systems, do not fulfill the specific criteria of being a man-pack portable radio solely tailored for long-range single channel UHF satellite communication like the AN/PSC-5D does. Each of them serves different functions and has different configurations suitable for various communication scenarios, such as HF or other types of transmission methods.