Guest Stars Susan Misner as Leah Mayne Christine Lakin as Rachel Wells Lauren Sánchez as NCIS Agent Sanchez Virginia Watson as Nurse Ruth Corruthers Michael Edward Rose as Marine Major Gordon Holcomb Joe Guzaldo as Pete Iger Randy Vasquez as NCIS Agent Roger Voight Alex Hyde-White as Dr. Adam Tallridge John Edward Lee as Former Marine Sergeant Matthew Gontz Robert Maxhimer as National Park Officer Will Elliott Ryan McCann as Former 1st Lieutenant John Mayne Wolfgang Bodison as National Park Inspector Edward Killian Sarah Lewis as I.C.U. Doctor