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35. ('fSl/S!) SSO Saigon,
270645Z March 1961.
36. ('fS;'/SI) 509th, 19.
37. (TS;'/SI) Ibid., 11.
SGN 66 INTEL,
38. (TS;'/SI) Theodore Lukacs, Focus on Khe
Sanh, Cryptologic History Series, 1969,.61~63.
39. (TS;'/SI) Johnson, 504.
40. (SHSI) See Whitebirch message from
September/October 1961.
41. (:~//~I) U.S.-ARVN ARDF Agreement, 6 July
1963, NCA ACC# 39325.
42. (S;'/SI) 509th, 33.
43. (TS;'/S1) DIRNSA 271858Z April 1962, AGO
No. 4109/27.
44. (TSl/Sn Gerhard, 30. COMINT Categories
refer to the determination of the degree of technical
sophistication of the cryptographic systems. There are
four Categories: III, II, II X, and 1.1
..... ....IThe categories also
reflect an intrinsic threat to the capabilities of C.S.
intelligence that might result from the compromise or
disclosure of such information. Categories equate to
classification levels, Top Secret (III) , Secret (II, IIX),
and Confidential (I).
45. ff8;';'8I) DIRNSA 271858Z April 1962.
46. ('fSl/S1) DIRNSA 010500Z May 1962.
50. (TS;'/8t) 3UT426,5Augu~t1963.
51 r--__ ...,J .\h--.=;;;.
I
--------.....J
52. ('fS//St) Gerhard, 44.
53. (TSl/Sn 3RD RR0to CUSASAPAC, 240900Z
May 1962; see also 30VNR/T078-62, R 30131OZ,
March 1962.
54. (TSl/SI) 3I1VNR/T078-62.
55. ..(TS//8It"'"""3/GlO/VNG/R32-62, 3/GlO/
VNG/R33-62.
56. (TS//S1) B26 Report, "Increased
Communications Security On Viet Cong
Communications Network, October 1961-April1962,"
30.May 1962.
57. (TS//Sn Gerhard, 46.
58.ff8//St) NSAPAC to DIRNSA, 20 June 1962,
AGI29323.
59. (TBi/SO D33 to FI/D, WR-6046, 151730Z
June 1962.
60. (Ts;,/sol ~o DIRNSA, 050622Z
September 1962, AGI 42968.
61. ('fS;'/SI) DIRNSA to CUSASA, 102046 July
1962, AGO 07187/10.
62. ('fS//SI) Frost to Tordella, 010730Z May 1962,
F4/366.
63. fI'8t USIB-S-29-23/1, "U.S. COMINT
Relations with South Vietnam," 11 May 1962.
64. (TS//SI) 3/0.c=]R18-67, 1 November 1967.
65. (T~//~I) DIRNSA Message, 092156Z
September 1968.
66. (S//Sn Commanding Officer 3rd RRU, 8832,
050503Z May 1964.
67. (S;'/Sn DIRNSA Message, 251812Z May 1964.
68. (S//SI) D33 Memorandum, 13 May 1964.
69. f61 IRR 5399021667, 12 August 1967.
70.lN;'SIj- USM-808 10978, 040103Z February
1968.
71. (TS//S1) D33 to FI/D, WR-6046.
72. (rSl/Sn NSAPAC REP Vietnam to DIRNSA,
200952Z October 1966, D5972; DIRNSA to
NSAPAC REP Vietnam, 252145Z October 1966, DIR
181, CCH Series V1.HH.6,49.
73. (TS//SI) Johnson, 568.
74·1 I"The Danang Processing
Center," Cryptolog, October 1975,27. Much of the recollections
about the DGTS can be labeled "anecdotal,"
a term which, in recent scholarship, has taken on the
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