Federal job category 6600 includes trades focused on the inspection, repair, modification, and testing of armament systems used across military and federal operations. These roles involve working with small arms, artillery, launchers, and related accessories—ranging from rifles and pistols to mortars, cannons, and shipboard weapons. Employees in this category disassemble, clean, rebuild, and align components to ensure safe and reliable performance. The work requires deep mechanical knowledge, precision handling, and strict adherence to safety and operational standards.

Most positions fall under the Federal Wage System and are hands-on, often located in armories, depots, or field maintenance units. Workers may troubleshoot firing mechanisms, calibrate targeting systems, or retrofit older weapons with updated components. Whether supporting combat readiness or ceremonial functions, GS-6600 roles demand technical skill, attention to detail, and a strong commitment to accountability. These jobs are essential to maintaining the effectiveness, safety, and integrity of federal armament systems.