BUR #26290 has failed.
create alias ncr -> new_california_republic
category ncr -> general
category brotherhood_of_steel -> general
category enclave -> general
rename enclave -> enclave_(fallout)
The New California Republic, NCR for short, is a faction in Fallout: New Vegas and not a character.
EDIT: Also including Brotherhood of Steel and Enclave in here. I have created at least one chartag for generic characters like NCR Trooper, Enclave Soldier, Brotherhood of Steel Paladin, and Legionary (FNV)
Updated