The company is trying to get back on track after a tumultuous year.The U.S. healthcare industry has been a lightning rod for controversy for years, but it's especially murky right now.A political battle continues within the U.S. government over renewing expired Affordable Care Act (ACA) subsidies. The soaring cost of healthcare, even for those with private insurance, has become a focal point as people continue to struggle under the weight of rising living expenses.That's before getting to UnitedHealth Group ...