Question: How many insurgents have 602 as the total per period?
SQL: SELECT MAX("Insurgents") FROM "1-21636599-1" WHERE "Total per period" = 602.0;

Question: How many security forces?
SQL: SELECT MAX("Security forces") FROM "1-21636599-1";

Question: How many insurgents have 2003 as a period?
SQL: SELECT COUNT("Insurgents") FROM "1-21636599-1" WHERE "Period" = '2003';