OmniTek are a corporation who provide the security on MTI's Morning Star space station. They may be a subsidiary of MTI, or perhaps they are an independent contractor as the colonists we see during April's visit are indentured to Bokamba/Mercer. Their logo is a stylised O and T.
The guards wear head-to-toe body white armour that was probably meant to resemble that of Star Wars Imperial storm troopers. Coincidentally, the T-shaped helmet visor used by OmniTek guards was to appear later in Star Wars: Attack of the Clones (2002) as the helmet used by the Republic clone troopers, pre-cursors to the Imperial storm troopers.