The U.S. Postal Service has unveiled an Express Mail stamp with the image of the U.S. presidential transport helicopter, selecting a Sikorsky Aircraft VH-3D rather than the next-generation Lockheed Martin/AgustaWestland/Bell Helicopter VH-71 to represent Marine One. Issued for the first time at a joint open house May 19 at Andrews AFB, Md., the stamp was designed by William Phillips. It went on sale June 13. The cost is $16.25.