Which Army publication outlines procedures for accident investigations and reporting?

The correct choice for outlining procedures for accident investigations and reporting is DA Pamphlet 385-40. This publication provides detailed guidance on how to conduct investigations into accidents within the Army. It establishes the principles and responsibilities associated with accident investigation, including how to collect evidence, analyze facts, and report findings. Furthermore, it is essential for ensuring that all personnel understand the systematic approach required in these investigations, which helps in preventing future incidents by learning from past mistakes.

The other options focus on different aspects of Army regulations and procedures. For instance, AR 385-10 generally addresses Army safety program management but does not specifically delve into the protocols for conducting accident investigations. FM 21-66 pertains to the Army's policies on safety in operations but is not specifically geared towards the investigation process. DA Form 285 is actually a form used for reporting Army accidents rather than providing procedural guidance. Therefore, DA Pamphlet 385-40 is the authoritative source for understanding the steps necessary for thorough and effective accident investigations within the Army.