Final answer:
The Medal of Honor Roll Enrollment Certificate was established through a Congressional Act, which is distinct from Executive Orders used by Presidents, such as Truman's Executive Order 9981 for military desegregation.
Step-by-step explanation:
The Medal of Honor Roll Enrollment Certificate was established through a Congressional Act. This formal recognition is not something that a President can establish through Executive Order, Naval Regulations, or Presidential Directive. Rather, congressional acts represent the will of the legislative branch and have the full force of law behind them to create such significant recognitions or benefits.
Historically, executive orders have been used by presidents to direct government agencies and officials in the executive branch on how to conduct their administrations and operations. For example, Executive Order 9981 was signed by President Truman in 1948, which called for equality of treatment and opportunity in the armed services, effectively beginning the process of desegregation in the military. This executive order followed demands by black leaders and is now recognized as a significant step towards racial equality in the United States military.