Wali and Walled al-Sherhi were part of a well connected military family. They are up on Saudi military bases and the uncle was head of logistics for some branch of the Saudi Military.
For some reason they disappeared to Kandahar Airport to guard it under the Taliban, while Osama was based just next door at Tarnak Farms.
Their friend was Ahmed alNami who is on e go the hijackers who used an address at Pensacola Naval Air Station which was assigned to Saudi military officers.
Osama Nooh who also interacted with hijackers in San Diego is registered at the Pensacola address.