 Richard Lambert is a retired FBI agent who led the initial 9-11 investigation in San Diego, where Bayoumi and the two hijackers lived temporarily before the attacks. He's now a consultant on the case filed by the 9-11 families. If you've ever flown into Washington, D.C., one of the first things you see on the horizon is the Washington Monument. So if you know where your other targets are in terms of the Washington Monument, it helps guide you.