Im just gonna say this.... you just cant always be completely prepared these days when it comes to having the right equipment for the potential threat at hand. Planes and federal buildings both come to mind although there are plenty of other places. If I'm on a commercial airliner and it crashes in the ocean or out in the boonies and I actually live through the crash without any life-threatening injuries but I am completely naked and with out an ounce of useful gear, I'm the happiest man on earth! The best way to prepare for these situations IMO is not with gear but rather by practicing with your main survival tool... the one attached to your shoulders! Learn primitive skills, learn to improvise, learn to go without food (disclaimer: after talking to your doctor of course <img src="/images/graemlins/wink.gif" alt="" /> to make sure it's safe). In a nutshell, learn to adapt. Learning to use your brain will never hurt you, even when you have tons of gear, it can only help.
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Learn to improvise everything.