evidence: Some two dozen members of SEAL Team 6, based outside Norfolk, Va., were among 30 American servicemen killed Saturday when their helicopter came under fire during an operation in eastern Afghanistan. [...] Other SEALs killed came from Coronado, Calif. Seven Afghan commandos were also among the dead. It was the highest American loss since June 2005, when another Chinook helicopter operating in eastern Afghanistan was brought down by Taliban fire. Sixteen service members were killed that day; most of them were also Navy SEALs.