With the MoD anti-narcotic regime that is in place with the Armed Forces; specifically the Compulsory Drug Testing Team arriving on station without notice - locking down the unit - and randomly testing all ranks, he was dancing with the devil.
In nearly four decades of service, I have heard of the odd individual getting caught by CDT having used Marijuana but never any of the drugs more associated with guests of Jeremy Kyle on morning TV weekdays.
It is so irregular, that focus should be placed on why this situation developed to the point it has, setting individual personalities aside. It could as easy be symptomatic of one mans release from the stresses of a decade of warfare as it could the epitomy of individual arrogance. For sure it is better than suicide and if the story is accurately written (& I know how naive that sounds) it appears the individual was beyond caring.