Which status indicates that resources are not available for assignment due to either rest, mechanical failure, or personnel issues?

The status that indicates resources are not available for assignment due to reasons such as rest, mechanical failure, or personnel issues is "Out of Service." This term is typically used in emergency response contexts to signify that a unit, whether it be a vehicle, crew, or equipment, cannot be deployed at that moment. This could be due to needing maintenance, the crew being unavailable or depleted, or the unit undergoing necessary downtime after operations.

Other statuses like "Checked In," "Available," and "Assigned" imply that resources are either ready for deployment or are currently engaged in operations, making them unsuitable for indicating a lack of availability due to rest or mechanical issues. "Checked In" often refers to resources that are present on the scene or at a station but not necessarily available for immediate assignment. "Available" indicates that resources are operational and ready for deployment, while "Assigned" means resources have been committed to a specific task or incident. Hence, "Out of Service" accurately captures the situation where resources cannot be dispatched for any operational duties.