I am supposed to get to "Silver Level" for my next progress mission, and have been trying for about 2 months.  I have mannaged to get as high as bronze 3 but then get knocked back to level one.  I can field a team with a power of over 100, and get killed by a team with a power level of 53 without getting to fire a single shot.  How in hell is anyone supposed to advance???

P.S. -- Also in the last month I have spent over $1,000.00 purchasing chickens and armor, but still can get no where.