Final answer:
Explosive Ordnance Disposal personnel are responsible for rendering and disposing of egress/explosive system devices involved in mishaps. A mandatory investigation is required before the disposal.
Step-by-step explanation:
A mandatory investigation is required before the disposal of egress/explosive system devices involved in mishaps. Explosive Ordnance Disposal personnel are responsible for rendering these devices safe and disposing of them. The instruction that outlines the mandatory investigation requirement is not mentioned in the given information.