Sentence examples similar to completion is not mandatory from inspiring English sources

No, ISOP is not mandatory.

The request is not mandatory.

This particular course is not mandatory.

Using "Berkeley Haas" is not mandatory.

The writing component is not mandatory.

"The guidance Nice issues is not mandatory.

Drill is not mandatory at School #7.

Although consistent attendance is not mandatory, pre-registration is required.

Survival is not mandatory".

However, this mapping choice is not mandatory.

Voting is not mandatory.