officers were instructed to place these posters in conspicuous
places and a sufficient number of these posters was reproduced to
permit a change of display once every two weeks.
_Another aspect of the "security-consciousness" program was the
utilization in the forward area of short movie briefs which were
shown from time-to-time at all theaters just prior to the evening
feature.
These movies were produced by Lookout Mountain Laboratory
and the U. S. Naval Photographic Center and each depicted a senior
Task Force member giving a short talk on individual responsibility
for security.
Another special movie was produced in the forward
area in which the CJTF re-emphasized security precautions and this'
was shown once at each theater and on each ship just prior to the
first of the shot series.
In addition to these films, a second
group of ten, produced by Lookout Mountain Laboratory in the ZI,
was designed for more frequent showing and was devoted to depicting
various ways in which an individual might inadvertently cause a
breach of security.
A last group of films, also produced by Look-
out Mountain Laboratory in the ZI, dealt with questions and answers similar to those included in the examinations on Security
Memoranda Numbers 2 and 3.
Perhaps the single most difficult security problem to occur
during CASTLE was the recurrent one of "Q" clearances.
The time
interval between submission of initial papers on an individwl
and the conclusion of the necessary investigation prior to granting
clearance was such that personnel would oftentimes arrive at their
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