In 2004, the MOS changed from 12H to 21H. In 2009, the MOS changed again, from 21H to 12H.
21H Supervisor
The 21H Supervisor is responsible for overseeing a Construction Platoon composed of 32 Soldiers working on various projects. They ensure the mission readiness of 14 pieces of equipment and engineer tools valued at over $2,000,000. They interpret construction drawings and estimate material, time, equipment, and labor requirements for projects. Supervising the construction of wood frame, concrete, masonry, and prefabricated structures is also part of their role. They oversee the installation and repair of utility systems, ensuring compliance with specifications. Additionally, they provide direction for operator maintenance on assigned vehicles and equipment.
21H40 Battalion Liaison
As the Battalion liaison for electrical, carpenter, and plumbing engineers, the 21H40 Soldier is responsible for ordering supplies. They also supervise, train, and ensure the welfare and morale of an 8-man team in the S4 Section. Maintenance and safe operation of various types of equipment, such as LMTV and HMMWV, are within their purview. They are accountable for the maintenance of various sets, kits, and outfits, totaling more than $250,000.
Platoon Sergeant of Vertical Construction Platoon
The Platoon Sergeant of a Vertical Construction Platoon oversees a team consisting of Plumbers, Electricians, and Carpentry/Masonry Engineers. They are responsible for the health, welfare, morale, discipline, and performance of the platoon. They utilize the critical path method to design network flow diagrams and coordinate work activities with supporting units. The Platoon Sergeant provides supervision for all construction projects and ensures compliance with specifications through inspections. They also plan and organize training scenarios.
Squad Leader in an Engineer Support Company (ESC)
As a Squad Leader in an Engineer Support Company, the Soldier supervises a 14-Soldier squad comprising carpentry and masonry specialists, plumbers, and electricians. They perform various construction tasks, including interpreting blueprints, managing Bill of Material (BOM), determining manpower requirements, and directing construction assets. Additionally, they are responsible for the accountability, maintenance, and safe operation of assigned vehicles and equipment, such as HMMWV, FMTV, and generators, as well as various tool sets, kits, and outfits.
Senior Planner for U.S. Army South’s Engineer Directorate
In the role of Senior Planner, the Soldier is responsible for overseeing all construction projects in support of U.S. Army South and U.S. Southern Command exercises in Central America. They plan and synchronize engineer support and operations, develop Humanitarian Civic Assistance projects, and identify exercise-related construction requirements. They prepare engineer cost estimates and coordinate with U.S. Army South staff and supporting commands to ensure compliance with engineer, environmental, and construction policies and procedures.