A professional who this group includes occupations concerned with repairing, modifying, and maintaining in readiness small arms, field artillery, naval weapons, fire-control apparatus, munitions, and related ordnance.

• Occupations concerned with ordnance fabrication are covered in groups 694 and 736.
• Occupations concerned with instruments are covered in group 711.
• Occupations concerned with electronic equipment are covered in groups 722 and 823.