One theme of Ben Emmerson’s interim report on remotely piloted aircraft and targeted killings is that governments must be more transparent with regard to any civilian deaths they cause.  It’s easy to find lots of other calls for greater transparency on related issues.  For instance, many have urged the United States to be more transparent with regard to who the United States believes it can target as a matter of international law, where geographically it believes it may use lethal force, which forces count as “associated forces” for purposes of the Authorization for the Use of Military Force, and so on.

Ashley S. Deeks, How Does the UN Define "Direct Participation in Hostilities"?, Lawfare (October 21, 2013).