Which group identifies a supplemental manual or indicates the sequence number of specific TO data?

The fourth group is responsible for identifying a supplemental manual or indicating the sequence number of specific Technical Order (TO) data. In the context of Technical Orders, each group within a TO reference system has a distinct purpose. The fourth group is specifically dedicated to denoting the sequence of manuals that supplement the main operational or technical instructions, ensuring users can easily track and reference additional necessary documents for maintenance or operational procedures. This systematic approach is key in maintaining the accuracy and reliability of the information needed for aircraft armament systems, as it helps in organizing essential materials in a straightforward manner for the personnel involved.

The other groups serve different roles in the classification and organization of TO data, such as the first group identifying the basic TO or the third group specifying particular types of equipment or systems, but it is the fourth group that focuses on the identification of supplemental material and sequence numbers.