Gas Turbine Systems Technicians — GSM (Mechanical) and GSE (Electrical) — are the engineering ratings operating and maintaining the General Electric LM2500 marine gas turbine propulsion plants aboard Spruance class (DD-963), Ticonderoga class (CG-47), and Arleigh Burke class (DDG-51) destroyers and cruisers. The LM2500 gas turbine propulsion plant replaced the steam turbine plants of earlier destroyer and cruiser classes, fundamentally changing the engineering space environment by eliminating the boiler room with its extensive asbestos-insulated boilers and high-pressure steam piping.

Gas Turbine Propulsion and Reduced Boiler Asbestos

GS Techs working in LM2500 gas turbine module enclosures do not encounter the same asbestos exposure environment as Boiler Tenders working in steam firerooms. The LM2500’s combustion and turbine components are sealed within the engine module, and the exhaust stream exits through exhaust ducts rather than through an asbestos-insulated steam distribution system. The primary propulsion plant of Spruance and Ticonderoga class ships eliminated the heaviest asbestos exposure categories of the steam propulsion era.

Residual Asbestos in Early-Hull Construction

GS Techs serving aboard the earliest Spruance class destroyers (DD-963 through approximately DD-975) commissioned in the mid-1970s, and the earliest Ticonderoga class cruisers (CG-47 through approximately CG-54) commissioned in the early 1980s, served on ships where residual asbestos remained in the hull construction:

  • Auxiliary boiler insulation — Spruance and early Ticonderoga class ships retained auxiliary boilers for hotel load steam generation, with asbestos insulation on auxiliary boiler bodies and steam distribution in early hulls built before asbestos substitution was complete in Navy specifications
  • Interior ship construction in early Spruance hulls — asbestos floor tile and some overhead materials in crew spaces in ships commissioned in the 1975-1980 period
  • Auxiliary machinery gaskets and packing in early-hull equipment installed before full asbestos phase-out in Navy equipment specifications

General Ship Interior Exposure

GS Techs living and working aboard Spruance and Ticonderoga class ships occupied crew berthing spaces. In early-hull ships with residual asbestos in interior construction, GS Techs accumulated exposure from the general ship interior environment in the same pattern as other crew.

VA Claims for GS Tech Veterans

VA presumptive service connection under 38 CFR § 3.309(d) may cover asbestos exposure for GS Tech veterans who served aboard early Spruance and Ticonderoga class hulls where residual asbestos was present in auxiliary systems or interior construction, and who have since been diagnosed with mesothelioma, asbestosis, or asbestos-related lung cancer.