Aside from having obvious military affiliation, it would most likely mean nothing other than being simply masculine. It's got a lot of power to it as well, since it is so indicative of war, and they are quite deadly for being such little things. The overall look of them is quite cool as well, and also that they come in an incredible variety of different models, it keeps them a popular design.
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Depending on the person it could mean any number of things, however it is most commonly associated with someone who has been in a war.