On the term "Rubber Ducky"

Crafty Screenwriting

The "Rubber Ducky" is Paddy Chayevsky's term for when the hero or villain, at a lull in the action, explains that he is the way he is because his mother took away his rubber ducky when he was three. It's always a nice scene, well acted, beautifully lit, with a powerfully written monolog that the writer spent days on. [snip]

A Ducky cheapens the character. Kurt Russell's character Jack O'Neil in Stargate is suicidal because his young son killed himself accidentally with a pistol he left around the house. To make us care more about his otherwise unpleasant character, O'Neil delivers a small monologue to James Spader's character Daniel Jackson. It is important to the picture that O'Neil is suicidal, but not why; and given O'Neil's contempt for Daniel Jackson, it's unlikely that he would open up to him about his guilt and shame. The emotional truth of the situation is that Daniel Jackson would never know why O'Neil is so willing to die. It might have been more emotionally truthful for the movie never to relay this information. But I wouldn't be surprised if Kurt Russell wanted the audience to know that his character had a good reason for being such a bastard. Actors want you to have sympathy for them.

A good example of a Ducky that never comes up is Thelma and Louise. It becomes clear over the course of the movie that something terrible happened to Louise (Geena Davis) in Texas; that's why the two women take the long way around to the Mexican border. You begin to realize that she must have been raped in Texas, and then disbelieved in court. But Louise never says anything explicit about it in the movie, and that makes her backstory all the stronger.

If development execs are asking you for the Ducky, the screenplay isn't working for them. Don't give them the Ducky, but do focus your scenes so they show the character. Go through your script again, scene by scene, and make sure that every time the hero acts, it shows us who he is. Make sure you communicate how he feels about what he's doing, and give him a fresh way of doing it, one someone else wouldn't have...
As re: screenwriting - don't give us the Ducky, meet our concerns with the character.

As re: iraq - don't give us the Ducky, meet our concerns with this war.