Revealing mistake: Whenever James, Sanborn, and Eldridge are riding in the Humvee, you can see panels of wood in between the doors and windows of the Humvee. If you look closely, the grain in the wood is visible.
Revealing mistake: In the explosion of the opening scene it is apparent that cut scenes have been shot with several hours time difference because the sun has moved. This is best visible in the reflection of sun in the helmet and shadows of the vehicles in the background.
Answer: It's a term similar to "a world of hurt". It's both outside of you and within you. The outside definition is that a hurt locker is anywhere you go to find pain. In the film's case, war-torn Iraq is the hurt locker. Inside, your hurt locker is the place you bury your anguish.
johnrosa