Unmanned airborne systems (UAS) provide a wide range of capabilities in areas such as agriculture, environmental monitoring, disaster relief, delivery of goods, media & communications and surveillance. While these systems are producing numerous benefits today they also can be used in manners that enable a broad range of security concerns. This talk will introduce the some of the technical challenges concerning the use of UAS, and approaches for counter UAS (C-UAS). SRC�s Silent Archer � system Counter-UAS System will also be introduced.