What does the brass mean, exactly, in military context

In books by many different authors I encountered phrases like this: He curses the brass for not caring whether he lives or dies. From context, it seemed to me that it meant high-rank officers

Army Values: What Being A Soldier Is All About

What is meant by 'military brass' in a military context? - Quora

Musical Instruments in Asterix & Obelix

What does the brass mean, exactly, in military context? - English Language Learners Stack Exchange

A tip of the hat: The evolution of headwear badges of the U.S. Military - Military Trader/Vehicles

Sending in the Troops: The Kerner Report, Civil Unrest, and the US Military - Modern War Institute

TRADITIONS - Army West Point

Artifacts

Military brass like what they hear from White House — but worry about becoming props - The Washington Post

WWII Slang From the Front

Original French WWI Trench Art Picture Frame Made From Scrap Brass As – International Military Antiques

Military Is Asked to March to a Less Expensive Tune - The New York Times