Which units are commanded by Lieutenant Colonel Francis Hepburn?
CREATE TABLE "table1_11793221_2" (
  "unit" text,
  "commander" text,
  "complement" text,
  "killed" text,
  "wounded" text,
  "missing" text
);
SELECT "unit" FROM "table1_11793221_2" WHERE "commander"='Lieutenant Colonel Francis Hepburn';