[Milsurplus] red/black TTY shipboard question

[Nick England]

Howdy gang - I'd like to understand how a couple of items were
actually used aboard Navy ships -

One is a key-operated CLASSIFIED/UNCLASSIFIED teletype line switch SA-734/SG
http://www.navy-radio.com/rtty/misc/sa734-sg-91.jpg
I presume CLASSIFIED means red (unencypted) circuits and UNCLASSIFIED
means black (encrypted)?
So an UNCLASSIFIED switchboard would be an SB-1203
http://www.navy-radio.com/rtty/patch/sb1203-02.jpg
and a CLASSIFIED one would be an SB-1210
http://www.navy-radio.com/rtty/patch/sb1210-02.jpg

OK - the actual teletype equipment connects to this switch via two
1/4" phone jacks, only one of which is uncovered at a time by turning
the key. What TTY equipment would be plugged in here - a 28KSR on a
roll-around stand? or test gear? or something permanently mounted but
with a flexible line cord? In other words if I saw one of these
switches shipboard, just what would be plugged into it?

And the related device is the UNCLASS/CLASS warning lamp ID-866/SG
http://www.navy-radio.com/rtty/misc/id866-sg-01.JPG
I assume this was controlled by the switch and installed near the
teletype equipment.

So the red WARNING lamp lets you know that this is a circuit for
UNCLASSIFIED info only and you'd better not type anything on that KSR
unless you want Boris and Natasha to read it.

I convinced myself all this made sense until I looked at this
installation aboard USS New Jersey, which seems exactly opposite....
http://www.navy-radio.com/ships/bb62/p1010024.jpg

So how did things actually work??? I've got these items installed with
my TTY gear - now I just need to find a KW-37 crypto unit at Dayton or
Fair Radio next week - ha!

thanks,
Nick K4NYW
www.navy-radio.com