Boatswain’s Mate (BM) – U.S. Navy Rating

Quick Facts – Boatswain’s Mate (BM)

• Abbreviation: BM
• Established: Among the oldest U.S. Navy ratings (formalized in 1794; continuous through WWI–present)
• Primary Role: Seamanship, deck operations, shipboard maintenance, leadership of deck divisions
• Special Note: Boatswain’s Mates are often considered the “backbone” of traditional Navy seamanship

Insignia of the Boatswain's Mate (BM), United States Navy. | GGA Image ID # 23623f8f7e

Insignia

The Boatswain’s Mate insignia consists of crossed anchors, symbolizing seamanship, authority on deck, and the Navy’s maritime tradition. It remains one of the most recognizable U.S. Navy rating badges.

Role and Responsibilities

Boatswain’s Mates are responsible for nearly every aspect of deck seamanship aboard Navy vessels and ashore. Duties include:

• Supervising deck crews during anchoring, mooring, and replenishment
• Operating and maintaining ship’s rigging, small boats, and deck equipment
• Overseeing painting, preservation, and cleanliness of the ship’s exterior
• Standing watch as helmsman and lookout
• Training and leading junior sailors in seamanship
• Managing ceremonial duties such as piping side honors and colors

Historical Context

World War I (1917–1918)

Boatswain’s Mates were integral in operating the U.S. Navy’s rapidly expanding fleet. Their seamanship skills supported convoys, minesweeping, and coastal defense operations.

World War II (1941–1945)

BM ratings were in high demand as the Navy grew to a wartime peak. They supervised amphibious operations, landing craft, and the vast increase in deck seamanship roles aboard warships and auxiliaries.

Korea, Vietnam, and the Cold War

Boatswain’s Mates continued as the essential deck force leaders, often responsible for damage control readiness and leading working parties ashore and afloat.

Modern Era

Today, Boatswain’s Mates remain a vital enlisted rating. They operate advanced ship-handling equipment, supervise underway replenishment, and preserve centuries-old traditions such as the use of the boatswain’s pipe.

Tradition and Culture

The Boatswain’s Mate is one of the Navy’s most iconic roles. Known for their leadership on deck and their distinctive use of the boatswain’s pipe, they symbolize naval heritage. Many Navy ceremonies — from piping aboard a commanding officer to announcing ship’s calls — rely on skills passed down through generations of BMs.

Related Ratings

• Quartermaster (QM) – navigation and helm duties overlap with BM.
• Signalman (SM) – historically separate, merged into QM in 2003, closely worked with BMs.
• Seaman (SN) – entry-level path before advancing to BM rating.

Specialties Within the Boatswain’s Mate Rating

• BM(SW): Surface Warfare qualified
• BM(DD): Destroyer-qualified Boatswain’s Mate (historical usage)
• BM(AAV): Amphibious operations (landing craft, WWII–Vietnam era)
• BM(Ceremonial): Ceremonial/cultural duties such as the boatswain’s pipe

Note: Unlike some technical ratings, BMs historically emphasized general seamanship rather than sub-specialization. Modern designators like BM(SW) reflect warfare qualification tracks.

US Navy Boatswain Ratings, Title, and Rank

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