The WLS will itself be a high priority target for the enemy. Survival limits the useful operating time at any single deployment site to 10-30 minutes, depending on the threat. It follows that the coverage required of the WLS is related to a section of the battle area appropriate to the stated time interval and that the system must have a very high mobility and short deployment time in order to move rapidly between assignments. These considerations are fundamental to the design of the ARTHUR WLS in balancing range performance against mobility and physical size.