What does 'Out of service subject to call' imply for a unit?

The phrase "Out of service subject to call" indicates that a unit is not available for immediate tasks or routine operations but can be called upon if necessary. This means that while the unit may be temporarily inactive or occupied with other matters, it remains in a state where it can respond or be deployed if an urgent situation arises.

This status suggests a readiness to assist when required, even though the unit is not currently engaged in active duty or responding to immediate calls for service. This understanding helps in situations where there may be a need to quickly mobilize resources without the unit being fully operational at that moment. Therefore, this condition highlights the unit's potential availability, contrasting with being fully available or engaged in emergencies.