I take it you're not familiar with how "optional" works. You can optionally not fill it in. They can optionally deny you entry. My wife's grandfather was asked

I take it you're not familiar with how "optional" works. You can optionally not fill it in. They can optionally deny you entry. My wife's grandfather was asked to volunteer for a construction project in siberia. He declined. They drafted him, then sent him anyway - and still called him a volunteer. That was optional too.