The head of security at the World Trade Center, David Velazquez, has given up his post following the revelations that a trio of BASE jumpers and an adventurous 16-year-old — but not a pair of CNN producers! — were able to sneak into the tower undetected. Velazquez’s now former employer, the Durst Organization, took over security of the building in January. Obviously, they’re still getting used to the job.