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.
MUST WATCH. Story highlights. Washington (CNN)Ohio Gov. John Kasich voted Monday for 2008 Republican nominee John McCain instead of for 2016 Republican nominee Donald Trump. Kasich wrote in McCain's name at the top of the ticket, Kasich spokesman Chris Schrimpf said, on his absentee ballot.