Consular officer

按照INA 101(a)(9) The term "consular officer" means any consular, diplomatic, or other officer or employee of the United States designated under regulations prescribed under authority contained in this chapter, for the purpose of issuing immigrant or nonimmigrant visas

在移民法的語境下，CO就是使領館的面試官，以及審批你的簽證的人（包括不面試但是參與審批工作的人）