An Afghan official has said the helicopter carrying soldiers from the International Security Assistance Force (ISAF) had crashed due to technical problems.
Five service personnel were killed when the UK helicopter they were travelling in crashed in southern Afghanistan, the Ministry of Defence (MoD) said.
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The annual event has earned a place in the record books ahead of the grand final of the 60th anniversary show in Austria this evening.
Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Some students argued that the centuries-old tradition of wearing gowns, suits and mortarboards to exams was 'archaic' and looked elitist.