The sign for "duty" taps a "D" hand on the top of the non-dominant wrist.
Make sure you do the sign for DUTY with the non-dominant hand palm-down.
DUTY:
Note:
The reason I point out the importance of doing the sign for DUTY with the non-dominant hand "palm down" is because if the palm is up, it is a version of the sign for "DOCTOR").
Memory aid: A doctor's duty is to help people. (Sign: DOCTOR DUTY HELP PEOPLE).
Notes: