The latest crumb is too vague without context. Here are some posts where castle is mentioned:

 

dZ68J_729282D_B^02928xABVtZ

b7al8920289-sLBTCZA99_jXK

38201820281028201820484739201837474

B_1

B_2

KILL_CHAIN

SKY_TAR_[E_BZ_y]

[]

[]PAK[]

[]-13-[]

A-9zBT1-033

"Republic-D"

"Republic-E"

"Republic-F"

"Republic-MILMAR-E"

INFIL-[2]-OP_TAKE_O_

WATCH_TOWER_OK

RED_RED_OK

RED_CASTLE_OK

NIGHT_BOX_OK

SKY_BEAM_OK

NORTH_TRADE_OK

MOUNTAIN_DEEP_OK

COMM_SAT_6_OK

COMM_SAT_7_OK

COMM_SAT_8_FALSE

COMM_SAT_9_OK

COMM_SAT_SEC_R140_OK

TELCON_SIG_CONF_C-83028

ZEBRA_PACIFIC_SIG_COMM_[GOOD]

DESIGNATE CODE: [ _D7_UND<93829]

ACTIVATE CODE: [0 0000 018739 7-ZjG]

Q, DELTA

 

T: B, F, J, 1,5,11-20, ^

Conf_d-ww_CON_off[dark]

_Conf_SIL-_EX

COMM_Castle_Active_7ZbV-WT9

RED1_RED2_

SAT_40k_se_c_[30m]

Godspeed.

P_pers: WRWY

Q

 

_27-1_yes_USA94-2

_27-1_yes_USA58-A

_27-1_yes_USA04

_Conf_BECZ_y056-(3)_y

The_Castle_Runs_RED_yes

Godspeed.

Q

 

USA94-2: MUTINY OR SEDITION ARTICLE

USA58-A: SENTENCES: REDUCTION IN ENLISTED GRADE UPON APPROVAL

USA04: COURT-MARTIAL JURISDICTION

This is the only parts I could decipher from these posts. However I do think The_Castle_Runs_RED_yes after these is significant, as RED_CASTLE seems to be a progression closer to court martial jurisdiction.