“…Consequently, we cannot provide a full picture of the ERFs and Dutch involvement, because accurate information can only be given by authorities and other organizations that remain reluctant to provide such information; if only because they are not investigated and/or not ordered by the Dutch government to share such information, revealing a reluctance of the Dutch government itself. Giving an accurate overview is further complicated because, next to the CIA, more agencies have been involved such as the US Department of Defense and the FBI (Mayer, 2005;Messineo, 2009). Therefore, we have taken on board recommendations to utilize publicly available flight data and other relevant data on known and suspected ERFs to evidence their existence, and document their characteristics (Raphael et al, 2016;Cordell, 2017).…”