Stephanie Shelton, a payload communications manager at NASA's Marshall Space Flight Center, joins NASA astronauts Joe Acaba and Mark Vande Hei for a call to the onboard crew of the International Space Station. Vande Hei and Acaba visited Marshall April 11 for their honorary Expedition 54 plaque hanging ceremony and to provide valuable feedback of their on-orbit science investigations with the Payload Operations and Integration Center team..