Which circuit supports communications for subordinate control?

• A. Secondary IVCS circuit
• B. Supplementary IVCS circuit
• C. Emergency IVCS circuit
• D. Misc IVCS circuit

Answer: (B)

In damage control communications, the IVCS (Inter/Voice Communications System) includes multiple circuits to handle different control needs. The supplementary IVCS circuit is specifically designed to extend and support communications for subordinate control, giving a dedicated path to and from subordinate control stations so orders can be issued and reports received without overloading the primary channel.

This makes it the best choice because it is built to back up and expand control capabilities, ensuring coordination with teams or spaces that report to a higher authority but operate separately from the main control station. The other circuits serve other purposes—emergency IVCS for operations when power or normal circuits are compromised, secondary or miscellaneous circuits for additional/alternate uses—but they aren’t dedicated to supporting subordinate control in the same direct way.