According to a study by the Rand Corp., up to 320,000 troops who served in Iraq and Afghanistan suffered traumatic brain injury. Previously, those with mild cases who suffered from headaches, dizziness, sensitivity to light, ringing in the ears, irritability and insomnia collect $117 a month. Today, the VA announced that benefit could increase to $600 a month. 

The new regulation will benefit between 3,500 and 5,000 veterans a year, the department said. It estimated the changes would cost an extra $120 million.