Idea: before each battle player can choose from randomly given 3 bronze and 1 silver contracts. Player could buy them with equipment or soldier orders. If he complete order, he receive 1.5x of spent orders, if he fails - nothing.
Details:
Bronze (for 2/4/8 orders):
Make 5/7/10 headshots
Make 10/15/20 kills with BAs or Semis
Make 20/30/40 kills with MGs, ARs or SMGs
Make 5/7/10 kills with grenades
Make 15/20/25 kills on a point
Silver (for 2 orders only):
Receive “Battle Hero”
Be in #3 or win the battle
Make 7 headshots
Make 20 kills on a point