Battles & Wars › Cold War › Vietnam War
Precision-guided munitions (smart bombs)
laser-guided bombs from 1968 (Vietnam); German Fritz X 1943· Invention or discovery· Weapons, armor & warships
Well documentedSolid records, physical evidence or scientific consensus.
Bombs and missiles that steer themselves onto a target using radio, TV, laser or satellite guidance, instead of simply falling.
See it on the Battles & Wars map →What happened
An ordinary bomb falls on a curve and often misses by hundreds of meters. A guided weapon adds a seeker and movable fins. Germany's radio-controlled Fritz X sank the Italian battleship Roma in 1943. In Vietnam, American laser-guided bombs, which home on a spot lit by a laser beam, arrived in 1968. GPS kits such as JDAM added all-weather accuracy in the 1990s. Guided weapons were under a tenth of bombs dropped in 1991 and about two-thirds in Iraq in 2003.
Why it matters
They made accuracy, not tonnage, the measure of air power: one aircraft could do what once took hundreds, with fewer aircrew lost, though wrongly chosen targets still kill civilians.
Think of it like
Like switching from a mailer sent to a whole zip code to a letter addressed to one street address.
How we know
Strike photographs (such as the Thanh Hoa Bridge, 1972), the US Air Force's Gulf War Air Power Survey (1993), and munitions counts published for each campaign.
Still debated
How much precision reduced civilian deaths is debated; accuracy depends on intelligence, as the 1991 Amiriyah shelter strike, which the US believed was a command post, showed.
Inside this (1)
Connections (4)
▸Desert Storm air campaign made world famous the Precision-guided munitions (smart bombs)Mostly agreed
The connection
Guided bombs were used in Vietnam, but in 1991 televised cockpit videos of laser-guided bombs hitting bunkers and bridges made 'smart bombs' famous worldwide. Though under a tenth of the munitions dropped, they did a large share of the damage to key targets and convinced militaries everywhere to buy them.
When and how
Iraq and Kuwait, January–February 1991; the videos were shown by General Schwarzkopf and other officers at press briefings in Riyadh.
How sure are we?
Munitions counts in the Gulf War Air Power Survey and the briefing footage itself record both the use and the publicity.
Debates and open questions
The videos showed hits, not misses; how accurate guided weapons were overall, and what share of the results they produced, remains disputed.
▸Precision-guided munitions (smart bombs) destroyed the Thanh Hoa Bridge (1972) in the Vietnam WarWell documented
The connection
North Vietnam's Thanh Hoa 'Dragon's Jaw' Bridge survived hundreds of US attack sorties from 1965 to 1968, costing several aircraft. In 1972 F-4 Phantoms carrying new laser- and TV-guided bombs knocked it down in a few raids, proving guided weapons could do what massed bombing could not.
When and how
Thanh Hoa, North Vietnam, April 27 and May 13, 1972; F-4s of the US Air Force's 8th Tactical Fighter Wing during Operations Freedom Train and Linebacker.
How we know
Air Force records, strike photographs and postwar surveys of the bridge document the earlier failures and the 1972 success.
Debates and open questions
Guided bombs came too late and in too small numbers to change the war's outcome; why development took so long is still discussed.
▸Precision-guided munitions (smart bombs) sank HMS Sheffield (Exocet missile) in the Falklands WarWell documented
The connection
On May 4, 1982, an Argentine Super Étendard jet fired a French-made Exocet, an anti-ship missile that skims the sea and homes on its target by radar, at the destroyer HMS Sheffield. It burned and sank days later; 20 crew died. Another Exocet later sank the supply ship Atlantic Conveyor.
When and how
South Atlantic, May 4, 1982 (Sheffield) and May 25 (Atlantic Conveyor); Argentina had only five air-launched Exocets.
How we know
The Royal Navy's Board of Inquiry report, released in fuller form in 2017, and Argentine air force records describe the attack.
Debates and open questions
Whether the Exocet's warhead exploded at all is disputed; the fire from its unburned rocket fuel may have done the main damage.
▸GPS (satellite navigation) now guides many Precision-guided munitions (smart bombs)Well documented
The connection
Laser-guided bombs need clear weather and someone to aim a laser at the target. GPS kits such as JDAM, a tail section with a receiver and movable fins bolted onto an ordinary bomb, steer it to set coordinates in any weather. Because they are cheap, guided bombs became the norm rather than the exception.
When and how
JDAM was developed in the 1990s by McDonnell Douglas, part of Boeing from 1997; B-2 bombers first used it in combat over Serbia in 1999.
How we know
Air Force procurement records showing hundreds of thousands of kits built, and munitions data from each campaign, show GPS weapons' growth.
Debates and open questions
GPS jamming in Ukraine has reduced the accuracy of some GPS weapons; how well they work against a capable enemy is debated.