What does BM mean in Military?

Brigade Major

In the British Army, a Brigade Major (BM) was the Chief of Staff of a Brigade. He held the rank of Major and was head of the Brigade's "G" Section (Operations and Intelligence). During WW1, the Brigade Major was reportedly "a key personality who affected the health and happiness of the battalions," as he would be in most frequent contact with the front-line troops and held responsibility for the planning of Brigade operations. Many Brigade Majors held the rank of Captain, e.g., the future Prime Minister Anthony Eden, who was a Brigade Major at the age of just twenty-one.

Governmental » Military