In VMPF, click on “Assignments” and then Exceptional Family Member Program Application. Then select “Apply to Change or Cancel Assignment, Travel of EFMP Family Member Non-Recommended” Click through the pages without actually submitting the request. One of the pages should show you if you have a pending assignment.
https://www.reddit.com/r/AirForce/comments/1crczrj/efmp_assignment_trick/