Specifying storage racks for compressed gas cylinders

What section would you recommend?

I chose 11 57 00 - Vocational Shop Equipment from the National Master Specification:
https://nrc.canada.ca/en/certifications-evaluations-standards/canadian-national-master-construction-specification/extranet/nms-sections

Since it is a navy shop for training sailors, “vocational” seems correct, but why mention it at all?