Julie Jenkins, one of the late astronaut Alan Shepard's daughters, attends the dedication ceremony for the Mercury Project/Messenger Mission stamp on Wednesday, May 4, 2011, at Kennedy Space Center Visitor Complex in Florida. The Postal Service dedicated the stamp to mark the 50th anniversary of Shepard's suborbital flight, Freedom 7. (AP Photo/Florida Today, Michael R. Brown)

Photo by: Michael R. Brown

Julie Jenkins, one of the late astronaut Alan Shepard's daughters, attends the dedication ceremony for the Mercury Project/Messenger Mission stamp on Wednesday, May 4, 2011, at Kennedy Space Center Visitor Complex in Florida. The Postal Service dedicated the stamp to mark the 50th anniversary of Shepard's suborbital flight, Freedom 7. (AP Photo/Florida Today, Michael R. Brown)