Which type of bill is NOT listed as one of the different types onboard?

The environmental bill is not recognized as one of the standard types of bills onboard naval vessels. In naval operations, bills serve organized procedures for various scenarios or tasks to ensure the smooth functioning and safety of the ship. Each type of bill has its specific purpose and applicability, focusing on emergencies, special operations, or regular operational procedures.

Emergency bills outline actions that need to be taken in crisis situations, ensuring that the crew is prepared to tackle unforeseen events effectively. Special bills pertain to unique circumstances or operations that may arise during missions, providing specific instructions for those scenarios. Operational bills encompass day-to-day procedures and the maintenance of normal ship operations.

Since the environmental bill is not categorized among these recognized procedures, it highlights the importance of understanding the various responsibilities and protocols followed onboard to maintain operational readiness and safety.