A fishing vessel that is required to have a fireman's outfit, must have all of the following in the outfit except a __________.

Correct Answer: Option D — combustible gas indicator

A mandatory firefighter's outfit under 46 CFR requires a self-contained breathing apparatus, protective clothing, boots, gloves, a rigid helmet, a safety lifeline, a flashlight, and a fire axe. A combustible gas indicator is cargo-related, not personal fire gear.