The following is the recently released investigation into the Dec. 6, 2018 crash between an F/A-18D Hornet and a KC-130J Super Hercules aircraft that killed six Marines and injured one off the coast of Japan.
http://www.documentcloud.org/documents/6431155-KCJAGAMN-TOTAL.html
Download document here.
https://news.usni.org/2019/09/26/marine-investigation-into-fatal-fighter-tanker-crash-off-japan