How can I limit the caliber dropdown in All Load Data to my bookmarks?

We have implemented a checkbox on the All Load Data page to limit the caliber dropdown options to your bookmarks.

IMPORTANT: This checkbox only shows up if you are logged on to the site with your email and password AND if you have at least one bookmarked caliber.

When you click the checkbox, the loads get filtered by your bookmarked calibers, and the caliber dropdown only shows your bookmarked calibers.