| Project Emily | |
|---|---|
 Thor missile T-110 (left of English Electric Lightning) in RAF Museum Cosford | |
| Commercial? | No |
| Type of project | Missile deployments |
| Country | United Kingdom |
| Prime Minister(s) | Harold Macmillan |
| Key people | Dwight D. Eisenhower |
| Established | 1959 |
| Disestablished | 1963 |
Project Emily was the deployment of American-built Thor intermediate-range ballistic missiles (IRBMs) in the United Kingdom between 1959 and 1963. Royal Air Force (RAF) Bomber Command operated 60 Thor missiles, dispersed to 20 RAF air stations, as part of the British nuclear deterrent.
Due to concerns over the buildup of Soviet missiles, US President Dwight D. Eisenhower met Prime Minister Harold Macmillan in Bermuda in March 1957 to explore the possibility of short-term deployment of IRBMs in the United Kingdom until the long-range intercontinental ballistic missiles (ICBMs) were deployed. The October 1957 Sputnik crisis caused this plan to be expedited. The first Thor missile arrived in the UK on a Douglas C-124 Globemaster II transport aircraft in August 1958, and was delivered to the RAF in September.
RAF crews periodically visited the United States for training, culminating in 21 operational training launches from Vandenberg Air Force Base. During the Cuban Missile Crisis in October 1962, 59 of the missiles, with their W49 1.44-megaton-of-TNT (6.0 PJ) thermonuclear warheads, were brought to operational readiness. The Thor missile force was disbanded in 1963, and the missiles were returned to the United States, where most were expended in military space shots.