In an expeditionary install, the energy absorber and fairlead beam are anchored to a:

The correct choice highlights the use of a deadman assembled on the site as the preferred method for anchoring the energy absorber and fairlead beam in an expeditionary install. A deadman is a buried anchor that provides stability and support, especially in applications where it is critical to withstand various pull forces and tensions. By utilizing a deadman, the installation can leverage the weight and friction from the surrounding soil or materials to effectively restrain the anchored equipment during operation.

In contrast, while other options might suggest alternative anchoring methods, they lack the specific advantages and capabilities provided by a deadman setup. For instance, using a concrete slab or moil points may not offer the same adaptability for shifting conditions in expeditions, and relying on asphalt over concrete with stakes could be less effective in ensuring secure anchorage. Additionally, a configuration involving stakes, lines, and turnbuckles may demonstrate limited effectiveness in high-stress scenarios. Therefore, the assembly of a deadman on-site represents the most robust and reliable anchoring solution in this context, aligning well with the requirements of expeditionary operations.