Which regulation outlines special commemorations and ethical observances?

The regulation that outlines special commemorations and ethical observances is AR 600-20. This regulation provides guidance on various aspects of Army conduct and operations, including the importance of maintaining ethical standards and conducting appropriate observances for significant events and commemorations.

AR 600-20 emphasizes the Army's commitment to values, ensuring that all personnel understand the significance of these observances in reinforcing the ethical framework and historic context of the Army's mission and heritage. By following the guidelines laid out in this regulation, units can create a respectful and meaningful environment for acknowledging important dates and events, which fosters a sense of community and shared identity among service members.

The other options, while they cover various areas of Army regulations, do not specifically address special commemorations and ethical observances. For instance, AR 600-30 deals with the Army's policies on the evaluation of individual performance, AR 600-10 pertains to the management and support of soldiers, and AR 700-20 covers supply policies and procedures. These areas do not align with the context of commemorations and ethical observances as outlined in AR 600-20.