The document outlines technical requirements for two midwave infrared (MWIR) relay lens assemblies intended for the Guided Weapon Evaluation Facility (GWEF). These custom optical assemblies will replace existing components and are crucial for developing a GWEF test system. Contractors are advised to identify any specifications that pose challenges or increased costs, along with potential alternative solutions. Physical requirements dictate that each lens assembly must have specific dimensions, be equipped with aluminum dust covers, and feature identifiable engravings and a flat black color. Environmental criteria stipulate operating and storage temperature ranges, as well as tolerances for shock and vibration. The optical performance requirements focus on essential parameters such as spectral range, transmission, encircled energy, and pupil diameters, ensuring compatibility with existing equipment. The objectives include minimizing ghost images, ensuring no vignetting, and applying anti-reflective coatings to enhance performance. This document serves as a comprehensive guideline to solicit proposals aligning with the precise technical and operational standards necessary for the successful integration of the new lens assemblies into the GWEF system.