Final answer:
To clear an IDF Code, a four-character SUFFIX using the letters G, D, S, or X should be added by removing any existing letters after the IDF Code and entering the chosen suffix into the MCT.
Step-by-step explanation:
When clearing from a call and needing to add a SUFFIX to the IDF Code while entering information into the MCT, one must use one of the following characters: G, D, S, or X. These characters are added to the existing code by removing any existing letter that follows the numerical portion of the IDF Code. For instance, if the initial code is 413A, the letter A is dropped, and the SUFFIX G is used to clear the code, resulting in 413G. It is important to note that only one of the specified suffix letters can be used and there is a limit of four character fields for this entry.