Had a quick squiz at your decode there anon, haven't looked into all the 'coded' messages in great detail, but the #522 OWL stringer post in your drop, you referenced the line:
P_PERS: WRWY [N1LB][FG&C]
I'm assuming = 'we are with you, no one left behind, FG&C'.
I just ran a few checks on FG&C acronyms and couldn't find much, EXCEPT, in a glossary of telecoms acronyms, particularly:
FG-A
One Dial-Up Network Circuit via 2-Wire Connection.
FG-B
One Dial-Up Network Circuit via 4-Wire Connection (Higher quality than FG-A, extra wires for signalling). ANI (caller's phone number) Service is optional.
'''FG-C
(Used primarily by AT&T).'''
Does this bring new light into the AT&T building situation?? Would make sense if this was a hint to comm via that network whatever it is.