Iowa Class Battleships (BB-61) — Asbestos in the Navy's Last Battleships

The Iowa class battleships — USS Iowa (BB-61), USS New Jersey (BB-62), USS Missouri (BB-63), and USS Wisconsin (BB-64) — were commissioned in 1943-1944 and represent the final generation of battleships in the US Navy. The Iowa class served through World War II (including Missouri’s role in the Japanese surrender ceremony), the Korean War, Vietnam (New Jersey’s 1968-1969 reactivation), and the 1980s Reagan-era reactivation of all four ships as carrier battle group surface fire support vessels. Built at the height of WWII-era naval construction in 1942-1944, Iowa class battleships contained extraordinary quantities of asbestos insulation throughout their massive engineering plants and extensive interior structure.

Massive Steam Engineering Plant

Iowa class battleships were powered by the most powerful steam engineering plant in the US surface ship fleet:

• Eight Babcock & Wilcox boilers — the Iowa class carried eight main propulsion boilers in four fire rooms (two boilers per fire room), generating steam at 850 PSI / 875°F for the four propulsion turbine sets. Each of the eight boilers used asbestos insulation on its casing, steam drum exterior, superheater headers, and boiler setting — an enormous total asbestos quantity across eight boilers in four fire rooms
• Main steam piping — the main steam distribution system carrying high-pressure steam from four fire rooms to four engine rooms in a battleship involves extensive piping runs, with asbestos pipe covering on every foot of main steam pipe throughout the battleship’s engineering spaces
• Four propulsion turbine sets — the four main propulsion turbine sets in four engine rooms had asbestos insulation on turbine casing external surfaces, with an additional GE or Westinghouse turbine set for each of the four shafts
• Ship’s service turbine generators — multiple SSTGs providing the battleship’s electrical load had asbestos-insulated turbine casings

Fireroom Environment Scale

The scale of the Iowa class fire rooms was extraordinary compared to destroyer or cruiser engineering spaces:

• Each Iowa class fire room was a large industrial space housing two massive boilers, with the total heat radiation from two high-pressure boilers requiring substantial casing insulation. The fire room environment in Iowa class battleships was among the most thermally intense and most asbestos-insulated of any Navy vessel
• Boiler Technicians assigned to Iowa class firerooms were in an environment with a greater total mass of asbestos insulation than any destroyer or cruiser fire room

Multiple Reactivations and Sustained Service

Iowa class battleships were reactivated multiple times across their careers, with engineering ratings serving aboard them during:

• WWII service (1943-1945) — initial wartime service with full crew in all four fire rooms
• Korean War service (1950-1955) — New Jersey, Iowa, and Missouri provided gunfire support during Korea with full engineering plants operational
• Vietnam era (1968-1969) — USS New Jersey’s Vietnam reactivation for gunfire support operations off Vietnam
• 1980s Reagan reactivation (1982-1992) — all four Iowa class ships reactivated and modernized with Tomahawk cruise missiles and Harpoon missiles. Engineering ratings serving aboard reactivated Iowa class ships in the 1980s were in the original 1944-era asbestos-insulated fire rooms and engine rooms

VA Claims for Iowa Class Veterans

VA presumptive service connection under 38 CFR § 3.309(d) covers asbestos exposure aboard Navy surface combatants. Engineering ratings who served aboard Iowa class battleships during any period of their active service — WWII, Korea, Vietnam, or the 1980s reactivation — and have since been diagnosed with mesothelioma, asbestosis, or asbestos-related lung cancer may qualify for VA disability benefits. Iowa class battleships represent among the most asbestos-intensive engineering environments in the US Navy.

Source notes: equipment-manifest entries (where shown) are sourced from public-record BUSHIPS (Bureau of Ships) documentation, NARA archives, and the public asbestos litigation record. Manufacturer attributions link to documented asbestos-product histories on AsbestosIndex.com where available. Nothing on this page constitutes medical or legal advice.