,
whsmen
garrison phase.
,
In gencral, the garrison phase from 17 November
1952 to 31 Hay 1953 was one of rehabilitation and maintenance of
5
.
cquipment.
Sone now cquipment was installed, but this served chiefly
as an improvement to current fad lities rather than an increase in
* the communications nctwork of the PPU.
|
' During the build-up and carly operational phaae of CASTLE,
the following major chances in facilities were planned and carried out:
a.
A major modification of Building 15 to provide a relay
eenter with on-line ercryption on tho major circuits, a facilitios con1
trol, an extension on the crypto vault, and a new dial exchange,
‘
f
b.
An extcnsicn on the Joint Trensmittcr Buiiding T4, and
instal” ation of additional transmitters and construction of additional
antonnis,
C
“
.
Expansion of the telephone cable plant.
d.
‘Tho installation of Comeenters at Site TARE, andNaN in
support of AEC operctions, and the Anstallation of Comconters at Head-
4
. quarters [TF SEVEN at ELLER and Headquarters, 16 7.2 at PRED,
ee
ar
Ce
.
.
,
whee
At the start of the ‘CASTLE Operation, the ‘detailed List
of Signal facilities was quite dence, and is attached forr information, .
w
30
Opersticnss
.
sie BS oo oon on oe
Rot
After it, the Communications Sect:n ado proparations for
oy
.
the disposi tion of commund.ca ion ‘equipment deemed to be in excess to.
requiredents for“garrison éperations Upon,completion ‘of this activity,
“coraindeat or a
| ctivities wore purely routine until the beginning of
“¢
“ae
the build-up phaeo
AP oy NN to
oy a