This caused John Frankenheimer to resort to Refuge in Audacity to get a needed shot of "Jiggs" Casey entering the Pentagon, which the Pentagon refused permission for obvious reasons. So, he got Kirk Douglas in full uniform and walked him up the steps of the Pentagon while filming from a parked car. Quite coincidentally, a couple of soldiers were walking down the steps as Douglas was ascending them. Not realizing who they were passing by, they gave what they took to be a superior officer a genuine salute, which Douglas, not missing a beat, returned. Needless to say, this bit of unscripted and unplanned verisimilitude made it into the film.