What functions are sustainment brigades capable of providing HR support for?

The correct choice highlights the comprehensive capabilities of sustainment brigades in delivering human resources (HR) support on the battlefield. Specifically, sustainment brigades are equipped to handle personnel accountability, which involves keeping track of all personnel within a unit, ensuring they are accounted for during deployments and operations. This is vital for effective command and control, as it directly impacts mission planning and personnel management.

Additionally, casualty operations are a crucial function of sustainment brigades, as they involve processes related to tracking, reporting, and managing personnel who become casualties during operations. This includes ensuring timely communication about the status of affected soldiers to their families and higher command.

Postal operations further complement these HR functions by ensuring that soldiers can maintain communication with loved ones and receive essential supplies and information, which is important for morale and operational effectiveness.

Together, these functions—personnel accountability, casualty operations, and postal operations—represent the core capabilities that sustainment brigades provide within HR support, making this choice the most accurate among the options provided.