Chief Master Sergeant William Candy is a member of the United States Air Force's Combat Control career field, a special operations career tasked with Air Traffic Control duties in austere and non-permissive environments as well as Close Air Support for other SOF teams. Sgt. Candy was selected by...
terminator.fandom.com
The article says the scene was deleted, but I saw it in the version of T3 on tv.
Anyway, to summarise, the guy they modelled the T800 (played by Arnie, with someone else's voice) on had a really annoying voice, so one of the designers (played by someone else, but with Arnie's voice) says they can fix it.
Apparently, Arnie had to work to maintain his trademark accent, living in the US started to make him too American sounding.