Below is an interesting article that illustrates the impact of a finding of "not in the line of duty" from a death investigation. Many benefits are not given to the family. For this spouse and her children, that meant an estimated $1,200 a month from the Army's Survivor Benefit Plan; GI Bill benefits; and possibly money from the Department of Veterans Affairs. She could be able to get all of the benefits retroactively.
See "A wife takes on Army to restore husband's honor and acquire his benefits," By Dianna Cahn, Stars and Stripes.