By Eric Brandner and Sandi Moynihan

JOINT BASE ANDREWS, Maryland—David Letterman shares a story from his 2003 USO tour to Iraq before taking the stage for the “Celebration of Service” event honoring the USO’s 75th anniversary and the fifth anniversary of Joining Forces.

You can send a message of support and thanks directly to service members via the USO’s Campaign to Connect. Your messages will appear on screens at USO locations around the world.