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The Report of the Iraq Inquiry
rotating individual units deployed and, where units were deployed on operations,
allowing units a period of respite between each deployment as set out in the
Service’s Harmony Guidelines.
Concurrency: the number of operations of a given scale of effort and duration
that could be sustained by the force structure. SDR 98 concluded that “not to
be able to conduct two medium scale operations at the same time would be an
unacceptable constraint on our ability to discharge Britain’s commitments and
responsibilities”.4
12.  SDR 98 also considered the “underlying problems of under-manning and overstretch
that we have inherited”.5 It defined overstretch as “trying to do too much with too little
manpower”. One result was that units and individuals were separated from their families
too often and for too long. Another was that preparation for other tasks and longer-term
training suffered. The additional pressures from “persistent overstretch” contributed
to higher exit rates from the Armed Forces, which exacerbated under-manning.
SDR 98 concluded:
“We must break this vicious circle. To do so we must match the commitments we
undertake to our planned resources, recognising that there will always be the risk
of additional short-term pressures if we have to respond rapidly to an unforeseen
crisis. We need to improve recruitment and retention so that our units are properly
manned. And we need to use our manpower in the most effective manner,
particularly seeking to avoid unnecessary separation or disruption to individuals and
their families.
“The Review [SDR 98] has designed a future force structure matched to the level of
commitments we plan to be able to undertake. These structural changes, combined
with measures to increase recruiting and retention, will ease overstretch.”
13.  The Harmony Guidelines described the maximum time that Service Personnel
should spend away from their families (known as Individual Separated Service)6 and
the minimum time that they should have between operational deployments (known as
tour intervals).7
14.  The MOD told the Inquiry that the Harmony Guidelines were developed to help it
“get the work/life balance right” for Service Personnel and that, as the name suggested,
these were for guidance and were not “rules”.
15.  Each Service (the Royal Navy, the Army and the Royal Air Force) derived its own
Harmony Guidelines based on an “analysis of historical norms and judgements, training
4  Ministry of Defence, Strategic Defence Review – Supporting Essay 6, Future Military Capabilities,
July 1998.
5  Ministry of Defence, Strategic Defence Review, July 1998.
6  The MOD defines Separated Service as “Absence from normal place of duty or lack of freedom to enjoy
leisure at the normal place of duty/residence at place of duty”.
7  Paper MOD, 25 November 2009, ‘Harmony Guidelines’.
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