Exceptions are not usually ignored. In recent years the DND even came out with a canforgen that un-authorised modifications to equipment would not be acceptable.
It was when the Iltis came out that Ottawa dictated that there were to be no field modifications including things like mapboards, map lights etc. There was to be no drilling of holes in the vehicle for anything unless it was for an authorized modification.
All that said, the strict rules sort of went sideways during Afghanistan. The LCMMs were very accommodating to the needs of the troops on the ground. Some unit procurements were accepted (like Eotech and ACOG scopes that were not in our system) which never would have flown before. But even then, vehicle modification teams would come either from the contractors who were in theater, or else teams that were sent from Canada. Modifications were not "ad-hoc".
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