Composite Steel Beam

 is an assembled item used in one mission.

Obtaining
can be crafted using the Assembly Station. The diagram is given to the player when they accepting the  Road to the Marsh and choose the Western (harder) route.

Alternatively, the diagram can be bought from the Research Center Exchange for 39 Data Discs after the mission.

Usage
One is required to complete the western road during Road to the Marsh mission. It has no other use.