Two points:
1. Your point 1 may not be valid if the regulation holds bylaw status for the jurisdiction in question and is signed appropriately, although it seems this may not to be the case in the situation the OP is referring to; and
2. Your point that I have highlighted above is not entirely accurate. Wording of the basis of many contraventions is based on the phrase "ought reasonably to have known about the rule/regulation/order." This is particularly the case with regulations based on, or supportive of the National Defence Act. If a regulation is published in 8 Wing's Routine Orders, for example, wherein the requirement to back vehicles into parking spaces (or pull through double spaces) is stated, then a member could not say, "I didn't know about that rule," as it was in fact published in orders that policy states all shall be familiar with.
I do concur with the general understanding wherein regulations that members are to be held to account for, must be made reasonably available and/or published, in order to have a basis of enforceability. Consider, however, that such regulations would apply to all who chose willingly to set foot (tire) on a Defence Establishment (similar to the 'subject to search' condition on all DND establishments).
:2c:
Regards
G2G