A question for SJG & COTI?
A new guy in my game is ISS Intel. He wants to know if they're would be a password system set up for Scouts to recognize each other. ISS the MASON's?????
I can see spy's and their "John wears blue suspenders" stuff. But would such nonsense have any reason to be in ISS field, just to Team Leaders?
Perhaps indeed secret signs or handshakes, might be useful on deep surveillance teams if another Scout is looking for an undercover observer.
These are just some thoughts off the top of my head.
Folks working intel might know (be briefed on) their comrades working in the same area of operation. If it is an area that several Intel operatives may be working, they probably share a handler who will arrange meetings as needed. If you are sent in to give an operative in the field new instructions, you would be briefed on who they are (they wouldn't have to identify themself) and you will probably be given all the information needed to prove you are authorized to contact them. For starters, knowing a code word or phrase for the current mission.
If it is a planned encounter (like meeting your handler) there would be a prearranged way of identifying yourself - good for this one meeting.
Due to possible risks, if it is a totally random encounter, why would you give away who you are? This isn't a social organization where members hang out and party together. This isn't a secret organization trying to get noticed by the right people (underground railroad).
Undercover operative in a bar: 'I see you are wearing the secret decoder ring. I'm on a secret mission too! I'll buy you a drink and we can tell each other all about our 'for your eyes only' missions.'
As indicated by someone else, in certain dire circumstances they might know certain things (name of the hand to hand combat instructor, the location of secret weapon cache, ...) that others in their line of work might know.
In conclusion, as others indicated, due to the risks of information falling into the wrong hands, also due to the time frame it takes to update passwords (due to Jump travel times) IMO there would be no secret universal system of identification.