English: At Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-131 Mission Specialist Naoko Yamazaki of the Japan Aerospace Exploration Agency awaits her turn to enter space shuttle Discovery. The crew members of Discovery's STS-131 mission, dressed in their launch-and-entry suits, are participating in the Terminal Countdown Demonstration Test, or TCDT, a dress rehearsal for launch. TCDT includes training on the emergency exit systems at the launch pad, driving practice of the M-113 armored personnel carrier and a simulated launch countdown. The crew will deliver the multi-purpose logistics module Leonard, filled with resupply stowage platforms and science racks, to the International Space Station. STS-131, targeted for launch on April 5, will be the 33rd shuttle mission to the station and the 131st shuttle mission overall