This is a sole-source procurement for the purchase, installation, and relocation of a specific airfield beacon light to a cell phone tower on the base, along with a wireless control system. The work must be performed at Ft. Eustis, Virginia. The requirement is strictly limited to the original equipment manufacturer, Electrical & Construction Specialists (ECS), Inc., for the model ECS-224M beacon to comply with FAA regulations. A memorandum from ECS confirms they are the sole source for this specific part.