SOM
start of message
SOP
standing operating procedure
SP
space bar
SPECAT
special category
SPS
Spectrum Planning Subcommittee, IRAC
spt
support
SSAN
social security account number
SSN
station serial number
SSO
special security office
SUBCOR
subject to correction
SUSDUPE
suspected duplication
swbd
switchboard
sys
system
SYSCON
systems control
SYSCONCEN
systems control center
T/A
traffic analysis
TAC
tactical
TAC CP
tactical command post
TACP
tactical air control party
TACS
TAbDS
tactical automatic digital system
TAS
tactical automatic switch
TASS
tactical automatic switching system
TCC
telecommunications center
TCF
technical control facility
TCP
traffic control points
TDA
table of distribution and allowances
TDM
TECHCON
technical control
TELECON
teletypewriter conference
TELEOX
telecommunications exchange
TF
task force
TLP
transmission level point
TI
transmission identification
TOA
time of availability
TOC
tactical operations center
TOD
time of delivery
TOE
table(s) of organization and equipment
TOF
time of filing
TOR
time of receipt
TOT
time of transmission
TRADOC
United States Army Training and Doctrine Command
TRANS SEC
TRI TAC
TRIB
tributary
TRT
time ready for transmission
TSC
Technical Subcommittee, IRAC
tt
teletypewriter
TTNP
TWX
teletypewriter exchange
UHF
110