LL, whoever you are, you are a
pr@t of the highest order. Firstly, as a military organisation the RAF has the right to make its own rules about the carriage of weapons, so don't quote civil law when discussing military cargo and pax.
Secondly, by default every UK/Allied military person who boards an RAF aircraft is ON OUR SIDE. He/she is not going to deliberately attempt to do anything to damage the aircraft or those on board...and don't start any further discussion about nutters and carelessness. A simple set of orders to trust the individual to make the weapon safe followed by an independant check will suffice.
And finally, the business about civil check in and rules....there is a fundamental difference between a military transport system where only authorised personnel may fly and the civil airlines where anyone with the necessary cash can get onboard, hence the rules about knives, etc. Don't confuse professional soldiers with tatooed f**kwits
Yes, we know you didn't make the rules, but you let yourself down by espousing them as some sort of flight safety message. I can just about accept the RAFP's need to check bags for illegal souveniers...but thats not a flight safety issue.