war
If you look at all the real wars going on right now, you come across the same two weapons, over and over: the AK-47 and the RPG-7--both Russian designs, and both older than your Dad.
They're the weapons that matter, because they're already out there, millions of units, enough to equip every guerrilla army in the world, simple enough that you can teach a peasant kid with hookworm and a room-temperature IQ to fire them, and cheap enough to buy in bulk.
A whole bunch of articles about war. Opinionated and interesting. Like "drew carey as a military buff"