Final answer:
The Secretary of the Army's role in the Army Safety Program includes developing safety policies, enforcing regulations, providing safety training, and coordinating responses to munitions and explosives transport accidents.
Step-by-step explanation:
The role of the Secretary of the Army in the Army Safety Program involves a number of responsibilities, but primarily, the Secretary serves as the Department of Defense (DoD) executive agent for emergency response to transportation accidents involving munitions and explosives.
Among their duties, they are responsible for developing safety policies and procedures, enforcing safety regulations, and providing training and education on safety. However, the key role specified in the question is coordinating emergency responses to hazardous incidents, specifically those concerning the transportation of munitions and explosives.