In Half-Life 2 the Metropolice were to originally have a Elite unit known as the Elite Metro Cop. Its model looks very similar to the Civil Protection model but instead has a different gas mask. His eyes were to be yellow meaning his human eyes must have been removed for the eyes.
In Half-Life 2: Raising the Bar the model for the elite is shown as a complete model though didn't appear when the Half-Life 2 Beta was leaked in 2003. Eventually when the 2016 - 2017 leak of Half-Life 2 occurred his entire model and textures were found and are currently being used by the Project Beta team. It was eventually found out that the elite used the same weapon skill-set as the Metropolice. Its textures however call him "Supercop".