Which statement about the last two digits (digits 5 and 6) of a UIC is accurate?

• A. They identify the unit's geographic region
• B. The last two digits indicate the parent, subordinate, and derivative units, including TDA augmentations to MTOE
• C. They indicate the serial number for the day
• D. They identify the ship to address code

Answer: (B)

The last two digits of a Unit Identification Code show the unit’s place in its organizational family. They indicate relationships within the unit’s hierarchy—parent units above, any subordinate or derivative units, and any TDA augmentations to the MTOE. This suffix lets you quickly see how the unit is organized beyond its basic structure and what nonstandard attachments or temporary configurations it has.

In Army design, the UIC is built so the trailing digits reflect this lineage and augmentation, while the main portion identifies the core unit. That’s why geographic region isn’t determined by those digits, and the day’s serial number or ship-to address code aren’t encoded as the last two digits.