Recently US decided to use drones for helping(?) Libyan rebels fight against Libyan leader. In another country (Pakistan), there has been huge hue and cry about the use of drones against the militancy. US already uses drones in the border region of AfPak (Afghanistan-Pakistan) against the taliban. These drones have been very successful in their operations. Almost 230 attacks have been made without about 2300 men killed in the attack in drone attacks in Afghanistan.
US had long back Unmanned Arial Vehicles which could fly across pacific non-stop.
Use of drones has taken war to next level. The human intervention is minimised considerably by use of such automated weapons.
US has effectively minimised the human loss (their) in any ongoing wars. Irrespective of their loosening hold on the financial markets, their hold on the military is tightening and quite gripping. Any economy without a strong military support cannot remain powerful.
Use of such automated weapons, US makes sure that, their own human losses are minimised and so the opposition to military intervention by US is brought down.
The opposition to military intervention in Iraq, Afghanistan, Libya, etc was due to the human losses in the war. By using such weapons and tools, US will continue interfering in others affairs and at the same time, reducing their risks involved in such operations.
All these operations in various countries act as good ground for live experiments of such weapons/vehicles.