Yes, everyone holding a security clearance is routinely polygraphed, then and now. But when I served, asking questions about sexual orientation was common on such tests, because queer people were not allowed to hold security clearances. On the theory we could be blackmailed by enemies of the United States. Of course, it was actually people INSIDE the United States, political leaders of the United States, who were persecuting us. No queer holder of a security clearance was ever charged or convicted of betraying the U.S., for any reason. The blackmail theory was made up nonsense.