Not that this is justification from a grammatical sense, but a lot of Army writing uses dual concepts like this, when talking about killing and capturing terrorist X, or meeting and exceeding a standard. It's like you state the minimum and the optimal in the same breath, even if it's contradictory in a literal sense.
The more I try and explain it the lamer it sounds, but take my word on it, it's a very Army form of expression.
Sad that there are so many people who didn't study hard and now have to go to Iraq. (/sarcasm)
Your explanation is perfect, and thanks!
As for the practice, it's lame indeed. "Killing and capturing" in particular would seem to be mutually exclusive.