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My spiritual teacher said this:
Summary: Precept against killing and a possibility that an aspiring Bodhisattva might actually choose to kill.
A student explains that since he has done military service and is trained in the use of guns, he is concerned that he may be called upon to use them where security is required.
There is no precept against carrying a gun but of course if you have one on you, then situations may arise where you are called upon to use it.
The way to think about it is to ask yourself what harm will be caused by using it to save lives. If it is that you will have to suffer the karmic consequences in the lower realms, are you prepared to do that for the sake of others?
If you are then you are following the code of conduct of a Bodhisattva. It is a more difficult path than the simple practice of keeping the precept against killing. It means you have to assess the situation and use your own judgement. You have to take the responsibility on yourself and you may make mistakes.
The most important thing in this remains your motivation - if your motive was good then this will mitigate the consequences to a great degree.
However, it is essential to remain humble and recognise that as an unenlightened being you are likely to make mistakes - so make sure you have faith in the power of repentance. It is good to have faith like that in any situation but particularly if you are being called upon to kill.
I hope this answer helps. It is wonderful to give yourself and your life to the service of others - keep praying to the Buddhas and aligning yourself with the Three Jewels. You need their protection and guidance. Remember that it is the good motivation behind what you do in the world that matters. You cannot control the outcome of your deeds in this world but the good karma you make by them and the loving connections you foster will be with you always.
Lama Shenpen Hookham.