WATERLOO, Iowa — John-Paul Sager appreciates the care he has received at Department of Veterans Affairs hospitals and clinics, but he thinks it should be easier for veterans like him to use their benefits elsewhere. Sager, a Marine Corps and Army veteran, uses his VA coverage for non-VA treatment of back injuries stemming from his military service. But he said he sometimes must make several phone calls to obtain approval to see a local chiropractor. “It seems like it takes entirely too long,”