NFL announces USO Tour headliners

NEW YORK -- San Francisco tight end Vernon Davis and Houston defensive end Mario Williams are among four players who will visit military bases in Southwest Asia this offseason as part of the NFL's annual USO tour.

Dallas Cowboys tight end Jason Witten and Cleveland Browns left tackle Joe Thomas also will participate in the tour.

The players will spend a week in Asia visiting U.S. troops as part of a program that started in 1966. Last year Jared Allen, Larry Fitzgerald, Will Witherspoon and Danny Clark visited troops in Iraq and Kuwait.

Coaches Tom Coughlin, Bill Cowher, Jeff Fisher, Jon Gruden and John Harbaugh made a separate trip to Iraq last offseason.