Every rifle we used for retirement ceremonies I was at while in the Navy was non-operational. It was just the SOP for such ceremonies.
I agree with you. These were ceremonial rifles that are rendered inoperable by choice. I would add that the VMI Keydets marched in the same inaugation parade with functioning weapons. Their weapons were thoroughly inspected by the SS as were the Keydets prior to marching.
All that said 0bama is a douche and a complete disgrace as the CIC!

