Blake Hall is a man on a mission: to help U.S. military personnel use "Web 2.0" Internet technologies to help one another and themselves. Hall's no stranger to demanding missions. A decorated former U.S. Army Captain and Airborne Ranger who led a scout platoon in Iraq, he relates how the first time he ever led a combat mission, his battalion commander laid his hand on his shoulder and said ominously, "Hall, don't screw it up." And based on the overwhelmingly positive, initial response to his and his co-founders' new, veteran-owned web venture, TroopSwap.com, an online community and marketplace for active duty U.S. military, reservists, veterans and their families, that battalion commander would be more than proud.