I use Word 2003. As a part of my job, I compile and edit documents created in
a non-US dialect of English for use in the US. This is frequently a
frustrating process, as Word seems to track the dialect that particular
passages were originally written in and prefers to use that dialect's
Spelling and Grammer settings for those passages unless I manually 'Set
Language' them back to [English, US].

I would like to force Word's Spelling and Grammer system to always and
without exception use [English, US], irrespective of the original language of
the document or passage that I happen to be editing. Is there any way to do
this?