Chief Master SergeantWilliam 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).
The "Sgt. Candy scene" is not present in the final cut of Terminator 3: Rise of the Machines, but it does appear as a bonus feature on the DVD. In a bit of humorous back-fill, the CRS representative who stated that Candy's voice can be "fixed", was dubbed by Arnold Schwarzenegger.
In the Making of the Video Game from the Terminator 3: Rise of the Machines DVD, it is implied that this scene was filmed to be used as a cut scene, and not actually intended to be used in the theatrical release. Since the scene was not included in the film and has, to date, not been reinstated in any subsequent edits (unlike, for example, the Kyle Reese and elderly-Sarah sequences which were reedited into reissues of Terminator 2: Judgment Day), its status in terms of canon remains unclear.
It is unlikely that this scene is canon to Terminator Salvation, since as of 2018, Skynet was still searching for a proper model for the Series 800 Terminator.
Voiceover: CRS (Cyber Research Systems) presents a preview of our upcoming product line. Say hello to the soldier of tomorrow; the T1 Battlefield Robot, a fully autonomous Ground Offensive System; and in the air, the Hunter Killer Aerial Weapons Platform. This isn't science fiction, it's realty thanks to our top secret innovation — Skynet — the revolutionary artificially intelligent Battlefield Management Network. From intercontinental missiles to the individual soldier in the field, Skynet is able to control them all.