<P> Gibbs is a highly skilled marksman with both his agency - issued SIG Sauer P228 and a sniper rifle . In the season 7 premiere, "Truth or Consequences", he kills the terrorists holding his team hostage from an exceptionally long distance and in "South by Southwest" he outshoots a professional hit - man in an approaching helicopter . His knowledge of the Marine Corps and training as a sniper often comes into use, as shown in the episodes "Ravenous", "Vanished" and "Twenty Klicks" where he uses his wilderness tracking skills and marksmanship to either aid the investigation and get the team out of trouble . </P> <P> Gibbs is a private man of few words who discloses little to nothing about his personal life . He avoids discussing his life or past before he joined NCIS, especially to agents and co-workers under him, which leads to his team members constantly speculating over his private life . Aside from his tendency to use military slang, he rarely mentions or speaks at length about his time in the Marine Corps although he is often referred to as "Gunny" by other Navy and Marine officers, occasionally dons a "USMC" hoodie or T - shirt when off duty and has a replica of the iconic Raising the Flag on Iwo Jima photograph framed and mounted above the fireplace in his home . </P> <P> In the season 4 episode "Singled Out", McGee asks Gibbs how long he has been a special agent, to which Gibbs responds, "16 years". This contradicts Gibbs' statement in the JAG season 8 episode "Ice Queen", when in response to Harmon Rabb's question, "How long have you been doing this, Gibbs?", Gibbs responds, "19 years". </P> <P> Gibbs holds service personnel in the armed forces in high esteem and to a higher standard . He becomes particularly indignant when the guilty party is someone in a position of trust and authority and has reacted violently on several occasions when apprehending corrupt high - ranking officers who committed crimes for monetary gain . </P>

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