A Seabee is a member of the U.S. Navy’s Naval Construction Force, a sailor trained both to build military infrastructure anywhere in the world and to fight to defend what they build. The name comes from the initials “CB,” for Construction Battalion, spoken aloud. Seabees pour runways, string power lines, weld steel, drill wells, and carry rifles while they do it. If you are wondering what is a Seabee in practical terms, the shortest answer is this: a uniformed tradesperson who can shoot back.
The force was created in 1942 because civilian construction workers in combat zones had no legal right to defend themselves under international law. Rear Admiral Ben Moreell pushed to militarize Navy construction so that the people building airfields under fire could return it. The first units were authorized on January 5, 1942, and the Seabee name and insignia were approved that March.1Naval History and Heritage Command. Seabees The unit motto, “Construimus, Batuimus,” translates to “We Build, We Fight.”
What Seabees Actually Do
Seabee work falls into two overlapping categories: expeditionary construction in support of military operations, and disaster response.
On the military side, Seabees follow combat forces forward and build what those forces need to keep operating. In World War II, that meant airfields on Pacific islands, including the six 8,500-foot runways on Tinian that launched B-29 missions against Japan. On D-Day, Seabees pushed pontoon causeways onto the beaches at Normandy and assembled the artificial Mulberry harbor from prefabricated concrete floated over from England.2Seabee Magazine. The U.S. Navy Seabees and the Invasion of Normandy In Vietnam, they laid the last plank on an expeditionary airfield at Chu Lai 23 days after coming ashore and spanned the Thu Bon River with a 2,040-foot bridge.3Naval History and Heritage Command. Seabee History – Vietnam More recently in Afghanistan, the 22nd Naval Construction Regiment completed more than 375 projects across 30 forward operating bases in a single deployment, including two rotary-wing airfields, 23 water wells, and berthing for 24,000 personnel.4Seabee Magazine. Seabee Regiments Leave Lasting Legacy in Afghanistan
On the humanitarian side, Seabees deploy to disasters at home and abroad. After the 2004 Indian Ocean tsunami, Navy forces airlifted an average of 522,000 pounds of food, water, and supplies daily during a 47-day operation. They cleared roads and stood up field hospitals after the 2010 Haiti earthquake, and they supported civil authorities along the Gulf Coast after Hurricane Katrina and across the Caribbean after Harvey, Irma, and Maria in 2017.5Naval History and Heritage Command. The Navy’s Humanitarian Mission
How the Naval Construction Force Is Organized
The NCF is built around three types of operational units. Which one a Seabee serves in shapes what they do day to day.
Naval Mobile Construction Battalions
NMCBs are the main construction battalions. They handle roads, bridges, airfields, buildings, pipelines, and water wells wherever a forward-deployed force needs them, and they organize into modular teams that can plug into Marine Air Ground Task Forces or other combatant commands. Active NMCBs are homeported at Naval Construction Battalion Center Gulfport, Mississippi, and Naval Base Ventura County in Port Hueneme, California.6Defense Technical Information Center. Navy Seabees – Versatile Instruments of Power Projection
Amphibious Construction Battalions
ACBs specialize in the ship-to-shore connection. During amphibious operations they act as beach support units, moving fuel, water, supplies, and equipment from ships onto the beach using causeways and other landing systems.
Underwater Construction Teams
UCTs are small units of Seabee divers who build and repair piers, wharves, harbors, underwater pipelines, mooring systems, and cable networks. They also conduct covert hydrographic surveys of ports and beaches before amphibious landings. Two UCTs are currently active.
Officers who lead Seabee units come from the Civil Engineer Corps. CEC officers hold engineering degrees and train at the Naval Civil Engineer Corps Officers School in Port Hueneme before taking command.
The Seven Seabee Ratings
Every enlisted Seabee holds one of seven ratings, grouped together as Occupational Field 6:7MyNavyHR. Seabees
- Builder (BU): carpentry, masonry, concrete, and general building construction.
- Construction Electrician (CE): power generation and electrical distribution systems.
- Construction Mechanic (CM): heavy equipment and vehicle maintenance and repair.
- Engineering Aide (EA): surveying, drafting, soil testing, and construction planning.
- Equipment Operator (EO): bulldozers, cranes, graders, backhoes, and other heavy machinery.
- Steelworker (SW): steel fabrication and erection, welding, and rigging.
- Utilitiesman (UT): plumbing, heating, air conditioning, and water purification.
These ratings mirror civilian construction trades closely. A Steelworker welds and rigs on deployment the way an ironworker does on a commercial job site. A Utilitiesman troubleshoots HVAC in a forward operating base the way a commercial plumbing and HVAC technician does in a building back home.
How Someone Becomes a Seabee
The starting requirements are the standard Navy ones: U.S. citizenship, a high school diploma or GED, qualifying scores on the Armed Services Vocational Aptitude Battery, and passing the physical and moral standards. The ASVAB score needed depends on the rating, so a higher overall score opens more of the seven trades.
Training happens in three stages. First is Navy boot camp at Recruit Training Command, Naval Station Great Lakes in Illinois, which is the Navy’s only boot camp location.8Commander, Navy Region Mid-Atlantic. Naval Station Great Lakes After that comes Class “A” Technical School, typically at Naval Construction Battalion Center Gulfport, where recruits learn their specific rating. A Builder learns carpentry and concrete work; a Construction Electrician learns power distribution.
The last stage is Expeditionary Combat Skills training, and it is what separates a Seabee from any other military tradesperson. ECS runs in four phases. It covers land navigation with map, compass, and protractor, followed by day and night practical exercises. Weapons training begins with the Beretta M9 pistol and moves to the M4 carbine, including battlesight zeroing, day and night qualification, firing from behind cover, shooting while moving, and transitioning from rifle to pistol when a primary weapon malfunctions. The final phase covers improvised explosive device recognition and convoy operations.9Defense Visual Information Distribution Service. Sailors Learn Expeditionary Combat Skills at NCBC Gulfport
Why the Job Translates to Civilian Work
One of the practical reasons people choose Seabee service is that the trade you do in uniform is essentially the trade waiting for you when you get out. The United Services Military Apprenticeship Program lets Seabees earn Department of Labor journeyman certificates while serving, by logging on-the-job hours in their military duties. Trades available include construction carpenter, cement mason, electrician, plumber, pipe fitter, sheet metal worker, operating engineer, welder, and construction equipment mechanic. Required hours run from 4,000 for trades like carpentry and cement masonry up to 8,000 for electrician, plumber, and operating engineer certifications.10USMAP. USMAP – Find a Trade
Equipment Operators pick up an extra advantage. The Federal Motor Carrier Safety Administration’s Military Skills Test Waiver Program lets service members with at least two years of experience safely operating heavy military vehicles get a commercial driver’s license without taking the CDL skills test, and the program is available in every state.11Federal Motor Carrier Safety Administration. Military Skills Test Waiver Program Between USMAP certifications, the CDL waiver, security clearances, and years of documented project experience in demanding environments, a Seabee leaves the Navy with credentials that civilian construction, utility, and engineering employers actively look for.