Alamo asked about Exercise Skyshield.
The US and Canadian air defence systems were merged within the North American Air Defence Command (NORAD) on 12 May 1958. Coordinated from Colorado Springs in the Rocky Mountains, the Americans and Canadians had every right to be proud of NORAD. To prove it fully they decided to mount a massive air defence exercise (Skyshield) in October 1961 which was to be fully realistic and to which Bomber Command was invited. High Wycombe was more than happy to oblige, especially as it gave them an opportunity to test the new Vulcan B.2 under virtually operational conditions, and 27 and 83 Sqns were detailed to send four aircraft each. The 83 Sqn aircraft were sent to Lossiemouth to attack from the north while the 27 Sqn element went to Kindley AFB, Bermuda, to penetrate from the south. On October 14 both groups set off. The northerly wave began with B47s going in at low level from 500ft upwards jamming out the ground radars. Behind them came the B52s between 35,000ft and 42,000ft supported by B57s, while finally at 56,000ft came the 83 Sqn Vulcans in stream. Electronic countermeasures proved so effective that only the first Vulcan heard an F101 Voodoo lock-on, and though numerous fighters were scrambled they all concentrated on the B52s so that by the time the Vulcans came through the interceptors did not have enough fuel left to climb to 56,000ft for another battle and the British penetrated unscathed to land at Stephenville, Newfoundland.
The southern wave too came in "using all jamming equipment and passive defence systems". The 27 Sqn aircraft penetrated on a broad front, but as they approached fifty miles from the coast, when the fighters were unleashed, the southernmost Vulcan turned and flew north behind the jamming screen provided by its compatriots. Thus, while the F102 Delta Daggers concentrated on the three lead aircraft, the fourth Vulcan crept round to the north and sneaked through to land at Plattsburgh AFB, New York.