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The TG 7.1 voice count-down receiver was used to drive TG 7.2 and TG 7.5
public address systems on Eniwetok and Parry Islan’s at Eniwetok Atoll.
JTF 7 utilized approximately 400 frequencies In the PPG. TG 7.1 was
assigned about 160 frequencies of this total, The greatest users of frequencies were Program 5 (Effects Aireraft) and Program 2 (Fallout), The 215
to 260 Mc telemetering band was particularly crowded, requiring maximum
coordination to meet requirements of users, After arrival in the PPG, it
became necessary for CJTF 7 to reallocate certain of the lower frequencies
because of harmonic interference.
The complexities of JTF 7 communications require an abnormal amount
of coordination, Experience has proved that this cceordination can best be
accomplished by persons! conferences, and as a result many trips are required to be made by the TG 7.1 Communicstions Officer.
3.14
SECURITY
As during Castle, only certain aspects of the security function were a
responsibility of IG 7.1. The security Hiaison function was delegated to the
Classification Officer, and the fmplementation of personnel—security policies
was delegated to J-1. Problems concerned with these aspects are discusse4
below.
3.14.1
Pradeparture Security Indoctrination
After receiving the comments of TG 7.1, CTG 7.5 on February 1, 1955,
issucd the "Security Indoctrination Letter for Task Group 7.1 ard 7.5." Subsequent to that date, each member of TG 7.1 was required to have on file
with the headquarters a completed Security Indoctrination Certificate prior
to being authorized travel to the PPG. Completed certificates on file with
the Task Group number 2366.
3.14.2
Transmission of ClassifiedDocuments inthe Personal Custody of
Individuals
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After securing the concurrence of CTG 7.5, TG 7.1 implementing procedures concerning this subject were published on July 7, 1955. Generally,
they followed the procedures observed during Castle, in that hand-carrying
of classified documents between the PPG and other locations was discouraged,
but was permissable if operational necessity so required and if certain security measures were observed. On November 25, 1955, Amendment No, 1
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