 For security reasons, the Pentagon forbids camera crews near the  entrances to the complex. John Frankenheimer (qv) wanted a shot of  Kirk Douglas (I) (qv) entering the building. So they rigged up a  station wagon with a camera to film Douglas, in a full Marine  colonels uniform, walking up the steps of the Pentagon. The salutes  Douglas received in that scene were real, as the guards had no  reason to believe it was for a movie!