From NFL.com - NFL News:
"Former Arizona Cardinals safety Pat Tillman, who gave up an NFL contract to join the Army Rangers, reportedly has been killed in Afghanistan.
In the wake of the Sept. 11 terrorist attacks in 2001, Tillman turned down a three-year contract with the Cardinals to enlist in the Army.
Tillman was a member of the 75th Ranger Regiment, and the Army refers to them as an 'elite combat unit.' Candidates must pass a stringent orientation course, where they are challenged physically and mentally, before they can even be selected. The Rangers are an infantry force trained to fight against any threat. Their creed: 'Rangers lead the way!' "