I am local to ARRL HQ. I HIGHLY ADVISE all members of this institution to get at least their technicians license. Not that a license is going to have any bearing when it all goes to hell. But at least for now you will be able to be in the know. CB radio alongside Family Bands do not require any type of license. Some do offer encrypted channels. Reality is that anything that is encrypted is already broken. If you want secure comms you will need a custom system.