Half-Life: Alyx Commemorative Patch
CMB is a patch from the Half-Life: Alyx Patch Pack container introduced on 22nd March 2020 as part of the release of Valve's virtual reality video game - Half-Life:Alyx.
The patch depicts the CMB logo which is an abbreviation of 'Combine'. The CMB are an inter-dimensional organization who act as the primary antagonists within Half-Life: Alyx.
This patch can be applied to one of three specific locations on each agent, and you can apply more than one for each agent.
Patches can be removed from an agent but the patch is destroyed when removed similar to a sticker after scraping it too many times.