How do I beat the Combat drill?

Hint 1 of 5:

Follow the directions of the instructor.

Hint 2 of 5:

If you still need help, keep reading.

Hint 3 of 5:

Just shoot everyone (there are no good guys).

Hint 4 of 5:

Reload as neccessary.

Hint 5 of 5:

You have 20 seconds and there is no par time.