One of the major technical contributions to the military operations in Southeast Asia has been the development of night vision instrumentation for use by our armed forces in night warfare. The basic electro-optical device which has made these extraordinary instruments possible is the three-stage image intensifier utilizing fiber optic face-plates for coupling the component stages together. The plates also serve to correct the field curvature of the electron optics in the separate tube modules. The performance of the image intensifier is in large measure governed by the properties of these fiber optic faceplates. This paper will include a description of the optical and physical properties of the fiber optic plates and the methods for testing and evaluation. Some of the performance characteristics of the intensifier tubes and the night vision instruments will be presented and the possibility of combining these instruments with flexible fiber optic relays will also be discussed.