According to the IMDb FAQs, to put someone in a "hurt locker" is to physically mess someone up, badly, and according to the movie's official web site, "In Iraq it is soldier vernacular to speak of explosions as sending you to "the hurt locker." Its Japanese title is a simple phonetic expression in Japanese katakana characters as "Haato Rokkaa", which does not make sense.
Anyway, one can imagine that being a team member to disarm explosives in Iraq is like being put in the world of pain. The origin of the pain is, for the American soldiers, that it was caused by American attack to make Iraq free. Those three men work truly sincerely at this ultimate danger. Through their effort, many lives of Iraqi people must have been saved. Yet, even the wife of the team leader is indifferent about their contribution. We should see deeper meaning of "War is a drug".
Anyway, one can imagine that being a team member to disarm explosives in Iraq is like being put in the world of pain. The origin of the pain is, for the American soldiers, that it was caused by American attack to make Iraq free. Those three men work truly sincerely at this ultimate danger. Through their effort, many lives of Iraqi people must have been saved. Yet, even the wife of the team leader is indifferent about their contribution. We should see deeper meaning of "War is a drug".