CGIS Agent Pike addresses Agent Tennant as "NCIS SAC". SAC stands for Special Agent in Charge, which is the title for the SSA (Supervisory Special Agent) in charge of a unit.
Eddie says he hasn't seen Tracy in 7 years, or 2,555 days to be precise. Now 7 x 365 = 2,555, however he then forgets at least one but most likely 2 leap days, which would make it 2,556 or 2,557 days. Anyway, it is extreme unlikely that this is exactly 7 years on that day, as he was in prison for 7 years and some time has passed since then.