ae
ACVEYT &
FICATION CANCELLED
BEST COPY AVAILABLE
heeled
DOE- Coote DTD 9-27-F)
sPwT/976S
Af SEP 1958
Biomedical Preject 4.2, Operation HARDTACK, Second Phase (U)
SUBJECT;
no379 De Fens,©uct EPR.
¥
Chief ef Research and Development. ocation WARC
TO:
Departaent of the
Washington
25, D. C.
Access Np 63-A 1773
Bow 3/3
Toller? JOS ARRaTAC
Proeram- its2Z
1. Inclosed herewith fer your informtion is a copy ef Confidential
letter, MEDDH, Office of the Surgeon General, Department ef the Arzy,
17 September 1956, subject: “Reappraisal ef Biomedical Project “HARDTACA®,
with a copy ef Inclesures 1 and 3 attached.
2, The existing Project 1.2 ebjectives vere established in a meeting
with your representotives in this Headcuarters on 25 August 1956, In
order ef priority, those objectives were:
a.
To determine the immediate lethal response of mine in an
b.
To obtain an RBE for weapon neutrons through determination
environment protected by normal tactical means (foxholes, tanks, and
armored personnel carriers)
ef the LD 50/30 in a biolegical specimen frem both the ganma and neutrons
and gama and fractional neutrons.
©. To provide additional back-up information on ewine, the
response of emll animals (mice) to both garmm and neutrone will be
studied,
measures.
d.
Evaluation of additional radiation measurements anc safety
At that meeting, it was wade clear that participation would be en a
development shot for which neither the yield nor the shot date could be
fixed in adwance with precision. However, it was considered that the
FE9ORA
a
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