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.
Kasich is known for being blunt and direct, but earlier in his talk, he noted some times where he had worked with the teacher's unions in Ohio before. Kasich spokesman Rob Nichols said that the governor didn't mean literally replacing teachers' lounges in schools and said he using a metaphor.