"Brass hats" is a slang term used to describe high-ranking military officers or politicians. When looking for antonyms, we can focus on words that describe the opposite of titles, authority or leadership. Some examples may include "subordinates," "underlings," or "junior staff." Additional antonyms could include terms such as "fledgling," "novice," or "greenhorn," which relate to beginners or those without experience. We can also look for words that suggest a lack of power or status, such as "commoner," "average person," or "rank-and-file." Given the negative connotation often associated with "brass hats," selecting antonyms that represent honest and humble individuals would be an excellent choice.