Your second source led me to the
PTSD study of May 2010. I did not shell out the $30 for the full text version but note that they estimate a 4% PTSD rate among those who deployed to Afghanistan (where number of tours did not affect this rate). Alcohol abuse and other behavioural issues are reported but one would need to establish what the rates were at time of joining up and then also measured against a sample of those never deployed to Iraq/Afghanistan (not sure if the full text version does that).
I did not see reference to tour lengths nor can think how that can be a factor as all Brit tour lengths are 6 months (for the battalions). It appears there is a tenuous and circumstantial link created as a result of comparison with US PTSD rates (30%) and the longer combat tours they have.
The invisible division: US soldiers are seven times as likely as UK troops to develop post-traumatic stress
PTSD Affecting More U.S. Soldiers Than British
There must be a different method of PTSD diagnosis used in the US as a seven times difference is just too great to be accepted on face value.
A 30% PTSD rate? ... nah.
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