What action must be taken if a unit has excess ammunition?

When a unit has excess ammunition, the appropriate action to take is to turn it in to supply channels. This procedure ensures that the ammunition is properly accounted for and can be redistributed to other units that may have a need for it. This process is critical for maintaining accountability and preventing waste, aligning with military logistics practices.

Turning in excess ammunition to supply channels allows for effective inventory management and helps maintain the readiness of units by ensuring that resources are allocated efficiently. It also ensures that safety standards are met, as excess ammunition can pose risks if not managed properly.

Other options such as selling it to other units, destroying it immediately, or storing it indefinitely do not comply with military regulations or best practices. Selling ammunition is not permitted as it undermines accountability and can create legal and safety issues. Destruction is a last resort and is only acceptable under specific circumstances, such as when the ammunition is deemed unserviceable. Storing excess ammunition indefinitely is not practical, as it can lead to problems with inventory management and potential safety hazards.