A father and a son play golf at the Army Navy Country Club, Arlington, Virginia; the father, a Marine colonel, prepares for another deployment in Iraq, and the son, Josh, prepares to enter Princeton University; when the father hits a ball in a sand trap, an explosion kills him; although the club is private, both the NCIS and the Army CID investigate, and the competition begins. Ziva disarms a second bomb, Gibbs and the Army officer in charge begin to cooperate, Tony shares wisdom with Josh, and a third bomb explodes. Abby again produces much useful data. The gang trace and find a fourth bomb, and Ziva disarms it too, but they lose the bad guy.