From the LA Times:
When Wendy Gonaver was offered a job teaching American studies at Cal State Fullerton this academic year, she was pleased to be headed back to the classroom to talk about one of her favorite themes: protecting constitutional freedoms.
But the day before class was scheduled to begin, her appointment as a lecturer abruptly ended over just the kind of issue that might have figured in her course. She lost the job because she did not sign a loyalty oath swearing to "defend" the U.S. and California constitutions "against all enemies, foreign and domestic."
You see, Wendy is a Quaker and a pacifist. Wendy was willing to sign the oath as long as should could append an addendum, stating that she could not take up arms. That wasn't satisfactory to Cal State Fullerton.