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 was born in McKees Rocks, Pennsylvania, an industrial town near Pittsburgh. He is the son of Anne (Vukovich) and John Kasich, who worked as a mail carrier. Kasich's father was of Czech descent, while his mother was of Croatian ancestry. Both his father and mother were children of immigrants.