Some interesting replies thanks, regarding the B-52's & Vulcan call signs whilst on operations around the world. The RAF call sign system seemed more complex than the USAF from what I have been reading here. Have occasionally heard a trigraph used by the RAF when they are flying over the UK.
When an 4 x Vulcan Scramble was launched eg Waddington Open Days 1970's 1980's did they use trigraph or was it something else?
Thanks
Boeing Jet