Which means of voice communication is primarily used in military operations?

The primary means of voice communication used in military operations centers around tactical radios, SATCOM, and secure communication networks.

Tactical radios are essential for real-time communication among units on the battlefield, allowing personnel to coordinate movements and operations effectively. SATCOM provides beyond-line-of-sight communication capabilities, facilitating communication in remote or difficult terrains where other forms may not be reliable. Additionally, secure communication networks ensure that sensitive information is transmitted in a protected manner, crucial for maintaining operational security.

Those aspects combined make this choice the most comprehensive and aligned with the needs of military operations compared to the other options, which include less effective or less secure means of communication.