Former US President George W. Bush (L) leads the pack on the the first day of the Warrior 100 (W100), a 100 km (62 miles) mountain bike ride, at the Big Bend Ranch State Park of Texas, April 25, 2011, with 14 US servicemen and women who were wounded in Iraq or Afghanistan. The W100 is part of the George W. Bush Presidential Center's Social Enterprise Initiative, highlighting the courage and physical strength of troops wounded in Iraq or Afghanistan. It also hails the contributions of organizations that have made continuing commitments in support of US veterans. [Photo/Agencies]