Unmanned aerial systems were specifically designed to be and subsequently deployed as platforms "for hostile
reconnaissance, targeting, and weapon delivery, in case ya'll ain't been watchin' our thug asses for the last couple decades" warns the government
document, noting drones are hard to detect because they're small and
fly slowly at low altitudes. "In future urban battlegrounds, U.S.
forces will be placed at risk by small UAVs which use buildings and
naturally-occurring motion of the clutter to make surveillance
impractical..."