What two documents are used by the unit to determine their munitions forecast?

The correct choice for determining a unit's munitions forecast is OPLAN and UCML.

OPLAN, or Operations Plan, provides a comprehensive outline of planned military operations, including the expected usage of munitions in various scenarios. This document helps units prepare for future engagements, determining the types and quantities of munitions that will be necessary to support operational goals.

The UCML, or Universal Core Module List, supplements the OPLAN by specifying the munitions required for the missions detailed in the OPLAN. It acts as a guide for the inventory and management of munitions that a unit needs based on its planned operations.

Together, these documents enable units to accurately forecast their munitions needs, ensuring they are adequately prepared for any upcoming operations.