Houston Texans' Mario Williams(L), San Francisco 49ers' Vernon Davis (L-middle), Dallas Cowboys' Jason Witten (R-middle) and Cleveland Browns' Joe Thomas (R) pose for a photo in front of an Apache AH-64D helicopter (of the Warlords), March 5, 2010. The four NFL All-Stars are participating in their first-ever USO tour, traveling to nine bases in eight days to visit troops serving in the Persian Gulf. (USO Photo by Dave Gatley.)

NFL players (L-R) Joe Thomas of the Cleveland Browns, Vernon Davis of the San Francisco 49ers, Mario Williams of the Houston Texans and Jason Witten of the Dallas Cowboys peer out the cargo door of a KC135 -Aerial Tanker as they touchdown in the Persian Gulf, March 3, 2010. The NFL 2010 All Star players are traveling on their first USO tour, the players will trek to nine bases in eight days to boost morale and bring a touch of home to troops. (USO Photo by Dave Gatley)

NFL players Jason Witten of the Dallas Cowbys (L), Joe Thomas of the Cleveland Browns (L-middle), Mario Williams of the Houston Texans (R-middle) and Vernon Davis of the San Francisco 49ers (R) pose for a group shot with the ground and air crew of a RC 135/JSTARS aircraft behind them, March 3, 2010. The four NFL All Stars are taking part in their first USO tour, traveling to nine bases in eight days to boost morale, sign autographs and extend their thanks to America's troops. (USO Photo by Dave Gatley)

NFL players Vernon Davis of the San Francisco 49ers (L), Mario Williams of the Houston Texans (L-middle), Joe Thomas of the Cleveland Brown (R-middle) and Jason Witten of the Dallas Cowboys (R) pose for a photo with the crew of the B-i Bombers, March 3, 2010. The 2010 NFL All Stars are traveling on an eight-day, nine-base trek through the Persian Gulf on a mission to boost morale and extend their thanks to America's troops. (USO Photo by Dave Gatley)

NFL players Joe Thomas (C) and Jason Witten (R) get a tour of an RC 135/JSTARS aircraft from a service member, March 3, 2010. The two Pro Bowl players are joined by fellow Pro Bowlers Vernon Davis-San Francisco 49ers and Mario Williams-Houston Texans on their first USO tour, traveling to nine bases in eight days the players will sign autographs, participate in meet and greets and extend their grattitude to troops. (USO Photo by Dave Gatley)

NFL players Joe Thomas of the Cleveland Browns (L), Jason Witten of the Dallas Cowboys (L-middle), Mario Williams of the Houston Texans (R-middle) and Vernon Davis of the San Francisco 49ers (R) pose with the crew of this C-130 cargo aircraft during their tour of the airfield. The 2010 All Star players are traveling through the Persian Gulf on thier first USO tour, March 3, 2010. Traveling to nine bases in eight days the players will have the opportunity to sign autographs, participate in meet and greets and boost troop morale. (USO Photo by Dave Gatley)

Mario Williams of the Houston Texans gets a bird's eye view from the pilots seat of a C-17 while Jason Witten of the Dallas Cowboys talks shop with Captain Paul Tucker. The NFL players are traveling on their first USO tour and are joined by fellow NFL All Stars Vernon Davis of the San Francisco 49ers and Joe Thomas of the Cleveland Browns, March 3, 2010. Traveling to nine bases in eight days the players will visit with troops, sign autographs and extend their thanks. (USO Photo by Dave Gatley)

NFL players (L-R) Joe Thomas of the Cleveland Browns, Jason Witten of the Dallas Cowboys (background-green), Mario Williams of the Houston Texans (R-Center), and Vernon Davis of the San Francisco 49ers (R) sign autographs for the crew of a C-17 cargo aircraft at the airbase, March 3, 2010.
(USO Photo by Dave Gatley)

NFL player Jason Witten of the Dallas Cowboys poses for a photo with Cowboys fans ontop of a Humvee proudly displaying a Cowboys flag, which Witten later autographed, March 3, 2010. Traveling on his first USO tour Witten is joined by fellow NFL All Stars Vernon Davis of the San Francisco 49ers, Joe Thomas of the Cleveland Browns and Mario Williams of the Houston Texans. (USO Photo by Dave Gatley)

NFL players (L) Mario Williams of the Houston Texans, Joe Thomas of the Cleveland Browns (L-next to Williams), Jason Witten of the Dallas Cowboys (center) and Vernon Davis of the San Francisco 49ers (kneeling next to Witten) pose with the entire crew supporting the defensive missile system, March 3, 2010. On an eight-day, nine-base USO tour the four players are on a mission to visit with troops, sign autographs and boost morale. (USO Photo by Dave Gatley)