Which was an air force officer and an ESA astronaut, Claude Nicollier or Roberto Vittori?
Claude Nicollier:  In 2000 he was assigned to the Astronaut Office Extravehicular Activity Branch, while maintaining a position as Lead ESA Astronaut in Houston. Roberto Vittori: Roberto Vittori (born 15 October 1964 in Viterbo) is an Italian air force officer and an ESA astronaut.
Roberto Vittori