SPECIALIZED EXPERIENCE: Must possess at least Eighteen (18) months experience or training in planning, layout, and construction skills to manufacture items and systems with dovetailed seams, set-in-bottom seams, burred-bottom seams, or wired or lock seams; experience using more complicated shop tools and equipment; experience in using metals including stainless steel, copper sheet, magnesium, honeycomb material and alloys; experience demonstrating the use of more complicated mathematical calculations and complicated measuring instruments. May be required to perform such additional duties as structural fire fighting, aircraft fire/crash/ rescue/duty, security guard, snow removal, munitions loading and handling, heavy equipment operator, maintenance of facilities and equipment, or serve a member of a team to cope with natural disasters or civil emergencies.