When a disillusioned Army scout is teamed with an overbearing sergeant to locate a Taliban stronghold, they find themselves caught behind enemy lines, dependent on each other for survival. (War)

First observation is the use of the obvious - if they're alone behind enemy lines they would be dependent on each other.
juxtaposing disillusioned with overbearing doesn't really click.
Beyond that I can't think of any way to give this a "hook".

The usual rule of thumb for a logline is 30 words or less. This one is 29 words, so...

Which one is the designated protagonist?

Is one of them (could one of them) be female? It would enhance the dramatic tension and broaden the audience appeal. Most war films flop at the box-office because, among other issues, the demographic appeal excludes that 1/2 of the human species that doesn't suffer from testosterone poisoning.

fwiw.

Sounds interesting, but, Aren't they already behind enemy lines just by being there? Also, it needs to be 25 words or less. Keep working.