We think of drone warfare as a post-9/11 phenomenon, but they've been around a lot longer than that. Here are a few high points in the history of pilotless aerial war machines:
1849 -- Austrians launch nearly 200 pilotless balloons mounted with bombs against the city of Venice.
1862 – Both sides of the American Civil War use pilotless balloons for reconnaissance and bombing sorties.
1898 – The U.S. military fits a camera to a kite during the Spanish-American War, producing the first ever aerial reconnaissance photos.
1916 -- The Royal Flying Corps took over 19,000 aerial photographs and collected a staggering 430,000 prints during the five months of the Battle of the Somme. (This visual analysis upturned the horse as the dominant technology of military reconnaissance.)
1943 -- The GB-1 Glide Bomb was developed to bypass German air defenses. It was a workable glider fitted with a standard 1,000 or 2,000-pound bomb. Made with plywood wings, rudders, and controlled by radio, the GB-1s were dropped from B-17s and then guided by bombardiers to their target below. One hundred and eight GB-1s were dropped on Cologne, causing heavy damage.
1945 -- Operation Aphrodite was one of the most ambitious drone projects in the Second World War. The plan was to strike concealed German laboratories with American B-17 "Flying Fortresses" and B-24 bombers that were stripped down and crammed with explosives. A manned crew would pilot these planes before parachuting out once they crossed the English Channel. At that moment, a nearby "mothership" would take control, receiving live feed from an on-board television camera. Despite the inventiveness of the U.S. Air Force and Navy, Aphrodite was a military failure. It even claimed the life of Joseph Kennedy Jr, after his B-17 exploded over the English countryside.
1946 -- "Pilotless Aircraft Branch" of the U.S. Air Force was established to develop three types of drones for use as training targets. Of the three, the airborne-launched Q-2 was the most important, becoming the "father" of a class of target drones.
1964 -- The U.S. first began to consider sending drones to replace its U-2s in spying missions over Cuba. Lightning Bugs flown by U.S. Strategic Air Command were subsequently used for surveillance in so-called "denied areas" across an increasingly widening Cold War battlespace including Cuba, North Korea, and the People's Republic of China.
1968 – Drones used extensively over North Vietnam for surveillance, marking a shift from being "targets" to remote "sensor" platforms that could check out the landscape below.
1973 -- The Philco-Ford Corporation developed a laser designator that could be attached to a Ryan BGM-34B Firebee drone, with the aim of creating a "strike drone."
1989 – DARPA seed money funds development of the GNAT, which was equipped with GPS navigation that allowed for autonomous missions of up to 48 hours, and also housed infrared and low-light cameras in a moveable sensor turret under its nose.
1994 – CIA bypasses acquisition rules to rapidly field the GNAT-750 and begins flying top secret missions over Bosnia-Herzegovina. According to the CIA director at the time, "I could sit in my office, call up a classified channel and in an early version of e-mail type messages to a guy in Albania asking him to zoom in on things."
1995 -- Predators – the follow-on version of the GNAT-750s -- were shown in an aviation demonstration at Fort Bliss. Impressed by the drone's capabilities, the U.S. Air Force soon established its very first UAV squadron, the 11th Reconnaissance Squadron at Indian Springs Auxiliary Airfield in Nevada, later named as Creech Air Force Base.
2000 -- After the CIA's Predator drone spotted who it believed was bin Laden at Tarnak Farm, Afghanistan, research went into shortening the kill-chain: getting Tomahawk missiles to fly from a submarine in the Arabian Sea to southern Afghanistan would take six hours to go through military protocols. The Predator's Hellfire was the solution. At Indian Springs, Nevada, a program was born under the Air Force's "Big Safari" office, a classified division in charge of developing secret intelligence programs for the military. In 2001 tests were made to turn the hunter into a killer.
2001 -- The armed Predator program was activated days after the terrorist attacks on September 11, with Predators reaching Afghanistan by September 16th 2001, and armed Predators reaching the country on October 7th. About the same time President Bush signed a directive that created a secret list of High Value Targets that the CIA was authorized to kill without further Presidential approval.
2002 -- The agency's Predator unleashed a Hellfire missile at a "tall man" and his lieutenants in February near the city of Khost, believing the man to be none other than bin Laden. But the analysts had acquired the wrong target. This time, it was innocent civilians gathering up scrap metal. All were killed.
2003 -- Drones' cameras and sensors linked to the global telecommunications system. Now a drone can be piloted—and its live feed viewed and its missiles aimed—from anywhere in the world. The drone pilots are now insulated from the risks of combat.
2010 – The most prolific year of drone strikes on President Obama's watch. CIA authorized to strike targets beyond approved kill list -- individuals with a suspicious 'pattern of life' or daily behavior.
2011 –RQ-170 Sentinel stealth drones used to monitor Osama Bin Laden's compound in Pakistan, and that intel is used to plan and conduct the raid that results in his death.