Final answer:
The Secretary of the Army, the Chief of Staff, and the Sergeant Major of the Army typically sign the Yearly Army Safety Messages, reinforcing the importance of safety in the U.S. Army.
Step-by-step explanation:
The three members of leadership who typically sign the Yearly Army Safety Messages in the United States Army are the Secretary of the Army, the Chief of Staff of the Army, and the Sergeant Major of the Army. These key figures are responsible for overseeing and proclaiming the importance of safety throughout the Army's operations. The signing of the safety message is a part of the Army's commitment to preserving the wellbeing of its soldiers and is a symbolic gesture reinforcing the message's importance to all ranks within the military.
This practice is rooted in the Army's broader culture of leadership accountability and proactive safety management, which is crucial for maintaining operational readiness and preventing avoidable accidents and injuries.