CREATE TABLE table_56583 ("Unit" CLOB, "Complement" CLOB, "Killed" CLOB, "Wounded" CLOB, "Missing" CLOB)

What was the number of Personal Staff Units Killed?
SELECT "Killed" FROM table_56583 WHERE "Unit" = 'personal staff'
SELECT "Killed" FROM "table_56583" WHERE "Unit" = 'personal staff'