Acting-Lieutenant, abbreviated ALT, is an officer rank in the Precursor Infantry Corps and Precursor Armoured Corps. Soldiers are usually promoted to this rank after ten or eleven months of service as a Primary Lieutenant. In the Precursor Infantry Corps, an Acting-Lieutenant can replace a Primary Lieutenant as commander of his/her unit, or if proven skilled enough they can replace a Lieutenant as the commander of his/her unit, which gives them lots of flexibility. If a member of this rank dies, a Chief Operator or Primary Lieutenant will take its place.