How to get 6 combat guards

I only have 4 guards in my combat report, how come others have 6?

Since a while now there are also combat Guards for the Advisor and Ambassador. These can be acquired via Master Recruitment (available if you ever purchased any pack), and the older ones are also available via the fragments you get from the Kingdom Threat, and can be transferred via the Goods Exchange. In the Guard building Recruitment Hall menu there is a Gallery button that shows all available guards.