Optical wireless communication could in many cases be an alternative to radio communication, due to among others its possibility of high bit rate and jamming resistance. For military operations in an urban environment where communication is necessary, optical communication has some disadvantages compared to radio. Normally, optical communication outdoors demands a free line-of-sight between the transmitter and receiver, which not always is possible in urban environments. The free-space optic links today are also not designed for moving platforms, but only for communication between buildings. Research in this field is however in progress. Following a short introduction to optical communication in urban environments, the report states the possibilities and the limitations for optical communication lacking a free line-of-sight. The possibility to use reflections from walls or other diffusively reflecting surfaces has been studied. Measurements of the attenuation when the signal reflects against different surfaces and at two different wavelengths have been performed. Calculations made from the measurement results shows a limited range for such a system, which is due to the relatively low laser output power and the attenuation when the beam reflects against the surface. A distance of up to 50 meters between the reflecting surface and the receiver could be possible, on the assumption that the background noise coming from the sun and other light sources can be filtered in an efficient way.