The project that is the subject of this report was approved by the Governing Board of the
National Research Council, whose members are drawn from the councils of the National Academy
of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of
the committee responsible for the report were chosen for their special competencies and with regard
for appropriate balance.
This is a report of work supported by Contract
DAAD19-00-C-0009
between the U.S. Army and
the National Academy of Sciences
.
Any opinions, findings, conclusions, or recommendations ex-
pressed in this publication are those of the author(s) and do not necessarily reflect the view of the
organizations or agencies that provided support for the project.