Thousands of former Army National Guard soldiers were mailed letters from the service component asking them to figure out whether they are owed unpaid bonuses, according to internal documents reviewed by Military.com. The Guard letters went to former soldiers who may have never received their promised enlistment bonus after the service component got behind on the payments. The vague correspondence essentially asks them to jump through bureaucratic hoops to find out whether they’re owed anything, and if so, how much, the documents show.