A memorial service is planned for a veteran airman killed in a motorcycle crash.  Sergeant David Fernandez of Travis Air Force Base died Sunday on Highway 128 near Lake Berryessa.  The 41-year-old Fernandez was riding with another man when they were allegedly cut off while trying to pass a slower-moving van.  Austin Meade of Oakland was arrested on DUI charges after he allegedly inexplicably turned in front of the two riders.  Friday's service will take place at the Twin Peaks Chapel on the Air Force base.