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If you are asking whether this a defence to AWOL then it is not.
Come what may he has attested and he is absent without leave.
They might well accept that he is suffering from depression so not fit and he might well be invalided out of the Army but he cannot just refuse to return to barracks without committing an offence.
The Army are entitled to ask that he attends their doctors.
There is no prospect of medical discharge unless he has seen a military GP.
They will ultimately find him and then he is at risk of a remand in military detention so it would be better to resolved this voluntarily.
Can I clarify anything for you?