Williams visits troops on NFL-USO Tour

Vernon Davis-San Francisco 49ers (R) and Mario Williams-Texans record a spot in the Armed Forces Network (AFN) studios.

San Francisco 49ers Vernon Davis gives this lucky Captain a lift while fellow NFL Pro Bowlers (L-R) Joe Thomas-Cleveland Browns, Jason Witten-Dallas Cowboys and Mario Williams-Texans get a good laugh, March 5, 2010.

NFL Players (L-R) Jason Witten-Dallas Cowboys, Mario Williams-Texans, Vernon Davis-San Francisco 49ers and Joe Thomas-Cleveland Browns visit with and sign autographs for staff at the Craig Joint Theater Hospital, March 5, 2010.

Mario Williams-Texans (L), Vernon Davis-San Francisco 49ers (L-middle), Jason Witten-Dallas Cowboys (R-middle) and Joe Thomas-Clevland Browns (R) pose for a photo in front of an Apache AH-64D helicopter (of the Warlords), March 5, 2010.

Mario Williams-Texans (L), Joe Thomas-Cleveland Browns (L-next to Williams), Jason Witten-Dallas Cowboys (center) and Vernon Davis-San Francisco 49ers (next to Witten) pose with the entire crew supporting the defensive missile system, March 3, 2010.

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

Mario Williams-Texans gets a bird's eye view from the pilot's seat of a C-17 while Jason Witten-Dallas Cowboys talks shop with Captain Paul Tucker.

NFL players Joe Thomas-Cleveland Browns (L), Jason Witten-Dallas Cowboys (L-middle), Mario Williams-Texans (R-middle) and Vernon Davis-San Francisco 49ers (R) pose with the crew of this C-130 cargo aircraft during their tour of the airfield.

Jason Witten-Dallas Cowboys (L), Joe Thomas-Cleveland Browns (L-middle), Mario Williams-Texans (R-middle) and Vernon Davis-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.

NFL players Vernon Davis-San Francisco 49ers (L), Mario Williams-Texans (L-middle), Joe Thomas-Cleveland Brown (R-middle) and Jason Witten-Dallas Cowboys (R) pose for a photo with the crew of the B-i Bombers, March 3, 2010.

Vernon Davis-San Francisco 49ers (L-middle), Joe Thomas-Cleveland Browns (Left), Mario Williams-Texans (R-middle) and Jason Witten-Dallas Cowboys (R) peer out the cargo door of a KC135-Aerial Tanker as they touch down in the Persian Gulf on March 3, 2010.