Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_11793221_2 ( unit VARCHAR, commander VARCHAR )

### Question ###
Which units are commanded by Lieutenant Colonel Francis Hepburn?

### Accurate SQL ###

SELECT unit FROM table_11793221_2 WHERE commander = "Lieutenant Colonel Francis Hepburn"