What mode must radio checks be carried out in without higher authority?

• A. Secure
• B. Unencrypted
• C. Public
• D. Open

Answer: (A)

Testing radio links should protect sensitive information, especially when there isn’t higher authority to authorize any non-secure mode. Conducting radio checks in a secure mode means the transmissions are encrypted so others can’t understand them. This preserves confidentiality and prevents potential adversaries from learning unit identities, locations, or operational details that could be useful if intercepted.

Unencrypted would let anyone listening hear the exact check content, which is not desirable in most operations. Public or Open would be accessible to everyone, defeating the purpose of safeguarding the information. So, the best practice when a higher authority isn’t present to approve other arrangements is to keep radio checks in a secure mode.