Can my unit just come in my home and take my personally owned firearms? Can the Police? Don’t they need a warrant?

It depends, but probably. If the unit members are acting pursuant to a valid order, then yes, they can enter your home to execute the seizure. Generally, police will need a warrant. This can be an especially difficult area of the law, given the nuances of what authorization or justification the command or police are using. As always, we do not recommend willfully refusing to comply. We do recommend you read this post for more information and that you seek the advice of experienced counsel to field this issue and the broader context of what you may be facing in an investigation.