Photographing military installations.
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Just kidding. Really, if you want to know any military secrets you can read about them in The New York Times.
Though I do like WW2 military books of which there are tons. I find the ones dealing with the psychology of those in charge the most interesting. e.g;
http://www.youtube.com/watch?v=5agLW7fTzBc
Despite having gone skydiving (once, it opened.) And decades in multidisciplinary martial arts, I am God's own Nerd.
I could never prove that I was heterosexual or NOT a Soviet spy through sports----It's truly pathetic if I'm ever coerced into playing jeopardy. Well, I learned something new every time. Ted Williams was nicknamed the splintered toothpick, right?
I held my own in chess with a 2065 expert rating. Do you know what that means? NO, not that you're an evil Soviet or SMERSH agent!
It means, you've got brains but no talent for the game---and yes, You are God's own Nerd.
I haven't been at the firing range in a while, though it was embarrassing when I was dating what's her name, who walked in with me and with just the most basic safety training ("Ooo! Mario I didn't realize it would be so loud! ) she then proceeded to put 5 shots through the x with a Sig Sauer 9MM at 25 feet, She was 'born with the eye'.
Must also go back to the gym to get in shape for the next whack--um sweet woman that I'm blessed with. My favorite exercise was The Deadlift--if you haven't tried it be careful! Not only is good form essential but you might start talking like Conan the Barbarian afterwards.

Oh, Back to handguns: I do regret not buying a Colt Python .357 (arguably the best revolver in the history of ever) an HKP7M8 which had superb ergonomics, shot 9MM with less recoil that a .22 Both discontinued now! Hey, what the hell? I thought this only happened to fragrances---and an East German Makarov.
*sigh*
BTW I wonder if online poker will ever be legalized back here in the good old USA? America has given the world freedom, bourbon, baseball and poker---but the casino lobby has a bit of a problem with people staying home in their pajamas and playing online. Gosh. I wonder why?
So, presently, my hobbies include interviewing for jobs and antique cars.
The latter a 1990 Suzuki Samurai. --A car that refuses to die, no matter how much mileage I put into it. Rather inspiring.

Cheers,
Mario