services offered by security consulting firms:

Penetration testing

Security analysis ( down to physical security)

vulnerability assesment

Firewall installation

training

forensics ( data recovery)

emergency response

intrusion detection

offsite management

disaster recovery

system maintenance and integration

as you can tell, this list could go on and on, as security are consultants are still consultants and do run-of-the-mill consulting. Hope some of those helped you wize