Memory Replacement

Memory replacement is a psycho-engineering process used by the Combine to transform humans into Overwatch Soldiers and Overwatch Elites. Some Civil Protection Officers are able to willingly undergo such processes to advance through the CP ranks.

Process
This process is generally done through use of machines capable of operating memory-cells of the human brain without the need to expose the brain itself. Memory-replacement results in all personal-related memories being wiped out and replaced with combat training programming and Combine indoctrination. This does not mean that personality is totally erased as it is done with Stalkers, but all personal-related memory is wiped, so the subject no longer remember who he was before procedure.

This procedure ensures that no Overwatch soldier is able to rebel against the Combine.

Sites
Memory replacement was carried in Nova Prospekt and probably in the Citadel.

Behind the scenes
The memory replacement device was designed by Dhabih Eng.