From their London headquarters, MI6 are monitoring James Bond's undercover operation at an arms bazaar on the Russian border. Described as a "terrorist supermarket", the impressive display of weaponry includes these two Vulcan cannons which are fixed to the top of a vehicle. When Bond realises there is a nuclear warhead on one of the Russian fighter planes, he hijacks it to fly it out of the path of the missile launched by Admiral Roebuck [Geoffrey Palmer] from nearby HMS Chester; in the ensuing mayhem the cannons are fired to try and stop him.