Mil. Slang:

v. - to "dual hat" or to "wear two hats" is to possess two jobs that are closely related, so that one person fills two roles in a chain of command. Can also be used sarcastically to differentiate between one's job title and one's real job: "I'm dual hatting as an intelligence analyst and coffee boy."

adj. - having two overlapping jobs: "I'm the dual hat division commander and battalion commander."

n. - one who has two overlapping jobs: "He's the new dual hat."

When a dual hat's two roles have conflicts of interest, he or she may preface an opinion by saying "I'm wearing my X hat now."