Question: When was the ship that had a fate of 'converted to laker, 1961; still in service' commissioned?
SQL: SELECT "Commissioned" FROM "2-12013207-1" WHERE "Fate" = 'converted to laker, 1961; still in service';

Question: When was the ship originally named Sachem finally decommissioned?
SQL: SELECT "Final decommission" FROM "2-12013207-1" WHERE "Original name" = 'Sachem';