How often must COSRs be conducted at a minimum?

The minimum requirement for conducting a Certificate of Compliance Review for ordnance (COSR) is every 27 months. This timeframe ensures that the safety and compliance measures associated with the handling and storage of explosives are consistently reviewed and updated as needed. The 27-month interval strikes a balance, allowing enough time for thorough inspections while ensuring that any potential safety issues can be identified and addressed before they become critical.

Conducting COSRs at this interval is crucial for maintaining the integrity of safety protocols on aircraft carriers, where explosives are present. Regular reviews help to promote a culture of safety, ensuring all personnel are aware of the latest safety standards and practices, ultimately reducing the risk of accidents or incidents involving ordnance.

The other options reflect longer intervals, which might not provide the same level of oversight and could potentially increase risk by allowing more time to pass without a thorough verification of compliance and safety standards.