SIE

Separation in Entry-Level Status

Service members who separate within the first 180 days of active duty (entry-level status) are typically released via SIE rather than a formal discharge with a characterization (Honorable, General, etc.). This means the separation generally does not appear as a discharge on your civilian record, though it does show in military records and can affect future enlistment attempts. SIE is not the same as an Honorable Discharge.

Related:DEP·Ship Day·DD 214