CREATE TABLE "table1_1015521_2" (
  "equivalent_nato_rank_code" text,
  "rank_in_spanish" text,
  "rank_in_english" text,
  "commonwealth_equivalent" text,
  "us_air_force_equivalent" text
);

Question:  What could a spanish coronel be addressed as in the commonwealth military?
SQL: SELECT "commonwealth_equivalent" FROM "table1_1015521_2" WHERE "rank_in_spanish"='Coronel';

Question: Give me a list of all spanish officer titles that could receive recognition as group captain in english
SQL: SELECT "rank_in_english" FROM "table1_1015521_2" WHERE "commonwealth_equivalent"='Group Captain';

Question: If you are a pilot officer in the commonwealth then what will you called as in the US air force?
SQL: SELECT "us_air_force_equivalent" FROM "table1_1015521_2" WHERE "commonwealth_equivalent"='Pilot Officer';

Question: If you're a major general in the US air force then what ranking will you receive in the commonwealth's air force?
SQL: SELECT "commonwealth_equivalent" FROM "table1_1015521_2" WHERE "us_air_force_equivalent"='Major General';

Question: If you get a ranking as major in the  english military then what would the spanish military address you as? 
SQL: SELECT "rank_in_spanish" FROM "table1_1015521_2" WHERE "rank_in_english"='Major';