Final answer:
The eagle's head on the insignia of a Colonel should face towards the right shoulder.
Step-by-step explanation:
For the insignia of grade for a Colonel, the eagle's head should face towards the right shoulder. This tradition stems from the belief that the right side represents the place of honor.
Having the eagle's head facing towards the right shoulder symbolizes the Colonel leading their troops into battle and represents their authority and power. It is important to maintain the proper direction of the eagle's head to adhere to the established military regulations and traditions.