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_13636_1 ( computing_mechanism VARCHAR, first_operational VARCHAR )

### Question ###
what's the computing mechanbeingm with first operational being february 1944

### Accurate SQL ###

SELECT computing_mechanism FROM table_13636_1 WHERE first_operational = "February 1944"