I've not have a great deal of experience in the Security field, I just have my certifications and also made recommendations to whoever my IT manager was at the time on how to make our network more secure, managing things such as Cisco ASA Firewalls, VPNs, Windows user credentials, security policies and so on.
I'd love to get into penetration testing, but I'm not sure I'm experienced enough just yet.
Good news to hear your husband is getting lots of interest, always good to hear. My understanding is that Security is one of those on the IT job list for people looking into the 457, mainly in Sydney (Don't quote me on this however!)
Best of luck to both yourself and your husband.