How long must AT exercise documentation be maintained at a minimum?

The requirement for maintaining AT (Antiterrorism) exercise documentation for a minimum of two years is rooted in both compliance and operational readiness. Keeping this documentation for at least two years allows sufficient time for review, evaluation, and analysis of the exercises conducted. This period ensures that lessons learned can be adequately captured and used to inform future planning and training efforts, ultimately enhancing the effectiveness of antiterrorism measures.

Additionally, retention for this timeframe aligns with various military guidelines as well as best practices, which emphasize the importance of a continuous improvement process in security operations. By maintaining these records for two years, commands can also demonstrate compliance during inspections or audits, confirming that they are proactively engaging in antiterrorism preparedness.

The other options reflect durations that do not align with established policies or guidelines specific to AT exercise documentation. Thus, two years stands out as the appropriate minimum duration for retention based on regulatory frameworks aimed at ensuring ongoing security and capability development.