If the IDF code already has a letter after the IDF Code, what should be done when clearing?

• A. Add another letter
• B. Ignore and leave as is
• C. Replace with Z
• D. Drop the existing letter and use G, D, S, or X

Answer: (D)

When clearing an IDF code, you reset the trailing status by removing whatever letter is already attached and then apply one of the approved clearance letters: G, D, S, or X. This keeps the code consistent and unambiguous for dispatch and responding units. Adding another letter would create a longer, nonstandard code and leave the status unclear; simply leaving the existing letter would imply the call isn’t fully cleared; replacing with Z isn’t part of the recognized clearance set. Using one of the approved letters after removing the old one provides a clear, uniform way to indicate the call is cleared.