A civil war rages on, and small teams of hand-picked combatants are air-dropped into the remote Cruor Trench with few supplies, and even less contact with the outside world. A handful of soldiers are given curt mission briefings and quickly shuffled off into positions, with only one objective: Eliminate all hostiles.
This is a d20 Modern game set in the modern day, where the PCs will be soldiers of any background or branch - army, air force, navy, etc.