From the introduction:
You are one of the few remaining immunes (from the Pacification Virus) and belong to the misfit Squad 76, known as the “Spirit of Baltimore” (of 100 squads with #1 being the best and #100 the worst). Battle Born, part of the League’s Military Assault and Combat Expedition (MACE) or as the troopers say, “Most Anyone Conscious and Expendable,” are equipped with an overly-complicated, mech-style battle suit. In a poker game, Sarge managed to win a Resolution Class dispatch ship, the Dauntless Perisher. Your job is to carry out the League’s orders to the best of your ability (command’s expectations are very low, very very low) while keeping the pacified and unarmored (affectionately known as squishies) safe (usually from your malfunctioning EE suit or poorly aimed kinetic shells).