Staff Sergeant Robert “Bobby’’ Bales’s decade-long Army record is a Rorschach Test of issues facing the military. It’s not a clear picture, but there are a lot of shapes and squiggles into which much could be read: strain from multiple deployments; financial problems; traumatic injuries; emotional pain from witnessing death and dismemberment; hostility toward the enemy that bleeds into racism (“Giving money to Hagji [sic.] instead of bullets doesn’t seem right,’’ he wrote on Facebook).