It may be that one set of rules (the UCMJ) requires him to lie (about this particular topic), while another set of rules make lying to congress illegal. "Don't

It may be that one set of rules (the UCMJ) requires him to lie (about this particular topic), while another set of rules make lying to congress illegal. "Don't Ask, Don't Tell" often put people into paradoxes where they were required by one set of rules to not disclose their sexuality while another set of circumstances + rules required them to disclose it (ie., not lie), or face penalties.