JACKSONVILLE, FL -- The Memorial Day holiday means it's a day on the water with the family. Chuck Singleton does what he can to makes sure his kids are safe out here. The concern is who else is out there. "You don't know where they come from," said Singleton. "You know, they could load up with a bomb or whatever and come right out here." With thousands of boats on the waterways, the worry is the recreational boat is now a Homeland Security threat. "Just the sheer numbers and ability to hide among recreational traffic is something that makes it...