4.12 Type of lettering. Letters shall be capitals
without serifs (sans-serifs) such as Arial, Futura, Gothic, or other
sans-serifs font. Numerals shall be Arabic except when Roman numerals are used
for type designation per applicable Government or industry specifications and
standards. Characters generated by automation processes(e.g., interactive
graphics systems or stencils) shall be permitted. Hand lettering shall be
allowed on an exception basis only.