HH [Hal Hollister] "Scheduling of Problem II," 16 April 1962, Confidential, Excised copy
National Security Archive
A 1962 project‑management memo reveals how the U.S. rushed to quantify the ecological fallout of ‘clean’ nuclear weapons before a July deadline.
Source: HH [Hal Hollister] "Scheduling of Problem II," 16 April 1962, Confidential, Excised copy Date: Apr 16, 1962 Archive: Record Group 330, Records of the Department of Defense, Office of the Assistant to the Secretary of Defense (Atomic Energy), Accession 69-A-2243, "AW- Ecological Study, Volumes I and II" Collection: "Clean" Nukes and the Ecology of Nuclear War Aug 30, 2017
Editorial Analysis
Original analysis by the DriftSeas editorial desk. The complete primary-source document, transcribed from the National Security Archive scan, appears in full below.
Scheduling the Unseen War
The memo dated 16 April 1962 is a project‑management blueprint for “Problem II,” a classified study of the biological and ecological fallout from a nuclear strike using the newly touted “clean” weapons. Drafted by Hal Hollister, an analyst attached to the Department of Defense’s Atomic Energy office, it maps out a tight July‑1 deadline for a report to the Military Liaison Committee (MLC). The urgency reflects a broader moment in early 1962 when the United States was racing to assess the strategic value of low‑yield, reduced‑fission designs that promised less radioactive fallout while preserving destructive power.
The memo sits at the intersection of two Cold‑War currents. First, the Eisenhower‑to‑Kennedy transition was still feeling the aftershocks of the 1957 “clean bomb” tests (e.g., the Redwing‑Mike and Redwing‑George series) that sparked public outcry over radioactive contamination. Second, the Department of Defense was under pressure from the Joint Chiefs to quantify any advantage that “clean” weapons might confer in a limited, tactical exchange—particularly as the nuclear arms race edged toward the concept of “counterforce” strikes aimed at Soviet missile silos rather than cities.
Hollister’s list of tasks reads like a rehearsal for a modern multi‑agency fusion center. He parcels responsibility among a handful of recognizable actors: Dr. Miller, a civilian scientist likely from the Atomic Energy Commission’s health physics branch; Mr. Crowley, a DoD analyst heading the Defense Biological Mission (DBM) group; and the “DODAC” office, the DoD’s nascent computer‑analysis center. Their collaboration reveals a paradox: while the study is framed as a “brief” estimate, it demands sophisticated fallout‑deposition modeling, radionuclide uptake calculations, and biological effect assessments—tasks that, at the time, required the limited mainframe capacity of the Defense Department’s IBM 704 series.
What the schedule subtly conveys is the tension between scientific rigor and political expediency. Hollister insists on “informal” coordination, telephone calls, and minimal travel, suggesting an awareness that bureaucratic friction could jeopardize the July deadline. Yet he also mandates written memoranda of assumptions from each sub‑group, a safeguard against later disputes over methodology—a clear nod to the contentious legacy of earlier fallout studies where divergent assumptions about dose‑response curves led to policy paralysis.
The document’s outline for the final report—four sections plus an appendix—mirrors the format of earlier AEC “effects” studies, but the language is deliberately stripped of any mention of strategic doctrine. By focusing on “surviving persons, livestock, and cropland,” the authors are building a data set that could feed directly into cost‑benefit analyses for policymakers debating whether “clean” weapons might make a limited nuclear war more “acceptable.” The omission of interlocking effects, noted in the draft’s methodological caveats, underscores a willingness to accept simplifications in order to meet a political timetable.
Why does this memo matter today? First, it illuminates the administrative mechanics behind the United States’ early attempts to quantify the humanitarian impact of a nuclear exchange—a precursor to the modern “nuclear risk” community that blends epidemiology, ecology, and computer modeling. Second, the very notion of “clean” weapons resurfaced in the 1970s with the development of neutron bombs, and again in contemporary debates over low‑yield tactical nukes. Understanding the 1962 scheduling reveals how quickly the defense establishment moved from conceptual design to impact assessment, a pattern that repeats whenever new weapons technologies emerge.
Finally, the memo’s declassification, complete with its redacted sections, offers historians a rare glimpse into the day‑to‑day choreography of Cold‑War science policy. It shows that behind the grand narratives of deterrence and arms control were mundane yet decisive actions: planning meetings, computer‑time requests, and the relentless ticking of a July‑1 deadline. Those details remind us that strategic decisions are often the product of tight logistical constraints as much as of high‑level ideology.
DECLASSIFIED Authority NND 83930 FOIA CASE # 44472
DOCUMENT TRANSMITTED HERewith CONTAINS CLASSIFIED DEFENSE INFORMATION
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DRAFT
TAB
HH
4/16/62
SCHEDULING OF PROBLEM II
Target date for final report to be transmitted to Chairman, MLC: July 1, 1962.
Note: outline calls for supplementary report by Sept. 1, 1962, on the most urgent steps needed for improving methods of estimation.
Schedule to meet target date:
- Wednesday, April 18th afternoon planning meeting:
- fix technical approach to problem (review outline)
- fix general division of labor between AEC and various DoD groups**
- fix arrangements for computer time and money
- fix liason arrangements among various working groups
- fix the nature of a memorandum to Chairman, MLC or the above
- fix next immediate steps
**Note: see next page for notes on division of labor and on coordination
DBM task forces to meet with me for the first time (one day each, at most) not later than the week of May 7; purpose is to get groups oriented to problem and approach being taken and fix on precise nature of information they will require to carry out their estimations and evaluations.
prompt damage assessment estimate (calculations and summaries of results) should be completed by the week of May 21.
I will work with the DBM group on world-wide fallout deposition estimates and radionuclide uptake estimates between about May 24 and May 29, although some of this work may slip over into the first week of June.
The three DBM task groups on biological effects should plan on working as much time as required of the week of June 11th, spilling over into the next week as needed. From each of these groups (and from Worldwide fallout group) I will expect to receive a written memorandum of assumptions used and the summary of actual estimates and evaluations.
I will use the last two weeks of June to tie all of the material together into a final report, and for review before transmittal.
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Division of responsibility:
- Attack assumptions in final form: Dr. Miller, Mr. Crowley, and HH
- Assumptions on radiological decay, fractionation, shielding factor,
and partitioning of debris: Dr. Miller, Mr. Crowley, and HH.
Concurrently with our work, I will submit a summary memorandum
of information to DBM Fallout Studies Branch for review and
comment, as well as for advance notice for their participation.
- The prompt damage assessment calculation, including estimates of
radiation doses to survivors up to the problem "starting time":
to DODAC (Mr. Crowley).
Note: it will be DODAC's responsibility to come up with an
estimate by the time due irrespective of possible
technical refinements to the model; naturally it would
be desirable to incorporate the more obvious and important
improvements in advance.
- The world-wide fallout deposition calculation (using DODAC input
information): to DBM Fallout Studies Branch working with Dr.
Miller and HH.
- Estimates of radionuclide uptake in the food chain: to Fallout
Studies Branch working with HH.
- Estimates of biological effects: to DBM special task groups
working with HH.
Nature of final report (see outline):
To be relatively brief in text, with free use of tables for condensing
and presenting information, with the text devoted to essentially two goals:
(i) presenting and discussing the problem and the approach used, including
the major assumptions; (ii) discussing the results, leading to some sort
of conclusion with reference to the context of the study.
DODAC and other DoD groups working on the problem will be expected to
provide summary memoranda covering assumptions and results of their parts
of the work.
Coordination:
To be informal as possible, utilizing telephone and informal memorandum
to avoid as much as possible trips from Germantown to the Pentagon or vice
versa. Primary purpose of memos is to confirm agreements and keep groups
together and current.
It is assumed that DoD (DODAC?) will handle its own administrative
arrangements with respect to computer services; however, for information
only, I would like to receive a summary of the costs and time required.
~~CONFIDENTIAL~~
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PROBLEM II. OUTLINE OF REPORT
Title of Report: The Biological and Environmental Consequences of a Nuclear Attack Using "Clean" Weapons - A Brief Study Organization and Topics of the Report: 1/
I. Introduction A. Description of the Study Problem B. Approach to the Study II. Description of the Attack Assumptions III. Results of the Study A. Estimate of Effects on Persons Surviving B. Estimate of Effects on Surviving Livestock and Poultry C. Estimate of Effects on Cropland, Forests, and Ranges IV. Conclusions
Appendix: Estimation of Radiation Exposure Levels and Radionuclide Contamination Levels
1/ See following pages for further development of topics
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Further development of outline topic I:
A. Description of the study problem
- point toward the conclusions by suggesting what questions this report is addressed to
- point out limitation of subject to matter primarily biological, including ecological, especially the economically important biological environment
B. Approach to the study
- purpose of considering the problem is related to ~~policy decisions on production~~ and use of "clean" weapons; a minimal study should, therefore, estimate effects both absolutely and by comparison with a corresponding attack using "standard" weapons.
- time limitation is severe; the essence of the study method, therefore, is the use of standard information on biological effects, where available, and standard calculation models incorporating standard assumptions for radiation exposure and radionuclide contamination levels.
- interlocking effects are, by and large, ignored, such as: (i) radionuclide uptake through the food chain is estimated using data for healthy plants and animals, (ii) latent biological effects are estimated independently of each other, and (iii) denial time for land use would not be determined on the basis of the users having already been exposed to radiation, etc.
- a "starting time" for the problem has been used which is different than (later than) the time of the attack itself; this time has been picked so as to eliminate from consideration as a part of the study the prompt, acute effects of blast, thermal radiation, and ionizing radiation; such effects are included in the prompt damage assessment calculation which forms part of the "input" information for the study problem.
- from the "starting time" of the study problem onward, protective or recovery measures for the survivors are ignored.
- in general, the approach is one of "cutting corners" and "rounding off"; but, besides that, information is meagre in any event for much of the problem; a supplementary report will be issued about September 1, 1962 on the more urgent steps needed for improving the estimates making up the study.
- numerical estimates are usually expressed as ranges which are to be regarded as the result of differing assumptions as well as of uncertainty in information.
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- 3 - Page 5 Further development of outline topic II: (Description of attack assumptions) No. of cases
- Size of attack: 1000 and 4000 MT total yield [1000, 3000, 10 MT] 2 2
- Type of attack: all surface burst (land) and all FOIA(b)(3) - 42 USC 2162(a) - RD DOE EO13526 6.2(a) 2 1
- Time of day, month, season, year, duration; the weather,
and other circumstantial assumptions that are relevant
1
6 **
[4. Military tgt, pub bldg mixed]
** not the total number of cases for prompt damage calculation, because
of radiological assumptions to be varied
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CONFIDENTIALPage 6 Further development of outline topic III:
A. Estimate of effects on persons surviving
assumptions used in the prompt damage calculation to define a "survivor" in terms of such questions as: (i) how was the "starting time" of the study problem picked (e.g. a time = 1 yr or less when the mortality rate dropped to "normal"), (ii) the life-expectancy distribution of the survivors, (iii) the radiation-mortality assumptions used, and (iv) ERD assumptions used.
a summary estimate of the cause of death of those who did not survive to the "starting time" of the problem; in particular, breaking out those who died from fallout radiation.
an estimate of the cumulative and ERD dose distribution among the survivors received up to the "starting time" and afterwards, so broken down.
statement of the biomedical assumptions used in evaluating the exposure data
qualitative description, using standard radiation syndrome characteristics, of the health of the survivors at picked times starting with the "starting time".
numerical estimates of the incidence of some latent effects, including genetic effects, in the survivors.
B. Estimate of effects on surviving livestock and poultry
mortality information, generalized
description of the capacity of the animal and poultry population to provide food and to breed new stocks
C. Estimate of effects on cropland, forests, and ranges
condition at "starting time"
estimate of degree of contamination
estimate of any very high exposure doe rates
numerical estimates of contamination levels of selected radionuclides
discussion of ability of cropland, forests, and ranges to produce
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- 5 - Page 7 Appendix: Estimation of radionuclide contamination and radiation exposure levels A. FOIA(b)(3) - 42 USC 2162(a) - RD DOE EO13526 6.2(a)
Estimates of radionuclide production by the weapons: MFP, Sr^90, Cs^137, I^131, "short-lived" gamma emitters and Sr^89, induced activities in soil and in weapon material, C^14 - it is necessary to make an assumption about solid-angle for neutrons in surface bursts (50-50 or 2/3-1/3, etc.) - specifically want Mc of induced activities produced ("of importance"), distributed by size of weapon and type of burst so can be related to MFP.
B. Assumptions about fractionation and partitioning of debris into local, tropospheric world-wide and stratospheric world-wide components
Estimates of amounts of debris, broken down by specific nuclides as above, going into the three categories of fallout
Assumption about radiological decay (t^-1.2, NRDL, etc.)
Assumptions about shielding factor (defined as the ratio of the dose received upto the "starting time" to the dose received if not protected; of course, the number of survivors changes too)
Assumptions about residence time and latitudinal distribution of world-wide fallout
Other important assumptions used in the prompt damage calculation, emphasizing those dealing with fallout
C. Summary of prompt damage assessment calculations
What survives up to "starting time" of problem
Of those who did not survive, breakdown of cause of death, with particular reference to radiation deaths and fallout deaths
Land contamination levels at "starting time" - gamma dose rate, contamination levels of selected radionuclides
D. Summary of world-wide fallout deposition estimate
Radionuclide deposition levels and rate of build-up
C^14 levels in biosphere
E. Estimate of uptake of internal emitters into persons (& livestock), including major assumptions
Biological "availability"
"Transfer coefficients"
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