Special forces emerged in the early 20th century, with a significant growth in the field during the Second World War, when every major army involved in the fighting created formations devoted to special operations behind enemy lines.
11 photos: John Kasich's political career. Ohio Gov. John Kasich speaks at the First in the Nation Republican Leadership Summit on April 18, 2015, in Nashua, New Hampshire. The summit was attended by all the 2016 Republican candidates as well as those eying a run for the nomination.
John Kasich: As of Wednesday morning, Kasich is reportedly no longer running for president, so he's available if Trump wants him. He would actually be a solid pick for Trump. For one, he's the only Republican who polls favorably against Hillary Clinton. And he has a lot of political experience, which Trump needs.