For how long must the memo for deviation from AWSS be kept?

The correct answer is 24 months, which is the required duration for retaining a memo for deviation from AWSS (Air Weapons Safety Systems). This timeframe is established to ensure that there is a sufficient record of any deviations from established protocols for accountability and review purposes. Keeping such documentation for 24 months enables thorough investigation and analysis of any incidents that may arise and ensures compliance with safety standards and military regulations. This period helps maintain operational integrity and provides a reference for future assessments or audits related to the safety and effectiveness of practices involving weapon systems.