Helm In Combat is an addon that automatically shows your helm whenever you enter combat, and hides your helm whenever you exit combat.
Original request for the addon was on the old official forums and is no longer accessible.
This addon was moved to the "Outdated Mods" section, even though it still worked perfectly fine. Hence I was forced to upload a new version with the latest interface number in the TOC file. No other change was made to the addon.