Allthough Thor was located in the UK and operated by the RAF, the nuclear warheads would remain at all times under the control of the United States (as was required by the McMahon Bill). Launch would be a joint decision by both countries - therefore, by implication, each country had the power of veto.
The legal interpretation of the McMahon Bill is that nuclear striking forces cannot be controlled by non-US commanders
The revised organisational structure saw each launch site given a separate squadron denomination............thus Project Emily was comprised of four Wings of five squadrons (for the Squadron numbers see 'Establishing the Bases').
A squadron consisted for five Flights - one Flight was always on duty and at immediate readiness during its eight hour shift
A Thor Flight on parade - the RAF Launch Control Officer and USAF Authentication Officer are at the front.
Behind are the Assistant LCO & MMTs together with RAF Police and other staff
Image © IWM