Not Ackbar, dear boy. It's when Luke says "I'm endangering the mission; I shouldn't have come." Somebody says don't be silly. He says "Vader's on that ship." Han replies, so as to calm him, "Don't get jittery, Luke, there are a lot of command ships." The latter part of what I wrote should have referred to the escape from Tatooine scene in ANH. SDs are seen chasing the MF, and Han says something about Imperial cruisers coming in. Saxton says this is just slang, or something similar. Double standards, methinks