Don't understand the last scene SPOILER

It's a final joke, one that plays off of Robert Stack's character's (the young pilot Sobinski) earlier walk-outs at exactly that same point in the play.

Remember that early in the movie Stack had twice walked out on Benny when he said the line "To be or not to be". At that he was devastated just because of his own ego, but we (the audience) knew that he was going to the arranged meetings with Lombard. Later, while impersonating Ehrhardt, Benny finds out about those meetings.

With the background of the husband knowing that the one particular "other man" had repeatedly had rendezvous with his wife during that speach, when Benny comes out on stage to give that he speach we see him first scan the audience to find Stack (who is once again in the second row). Benny looks straight at Stack as he starts the speech ..... and Stack keeps his seat: no rendezvous.

However, an instant later *another* young officer gets up and starts working his way out. The implication is that Lombard may well have taken up with this other officer. (As an extra piece of symbolism here: Benny as the husband can be thought of as primary, or first man in Lombard's life; Stack is the "other man", or Lombard's second man and is *always* shown sitting in the second row in the theater; This new officer is getting up and leaving from the third row, which could be taken as another visual cue that he is now Lombard's third man.) And notice that Benny isn't the only one who is flabergasted. When we get the shot of this officer leaving, we can see that Stack has spun all the way around with his hands on the back of his seat, staring agape at this new possible interloper.

Did you watch the entire movie?