Orbital Drop Shock Trooper

who was noble 6 before reach? in reach it said he was a lone wolf but where was he before that? please reply if you know the answer. https://www.google.com/imgres?q=noble 6&imgurl=https%3A%2F%2Fi.redd.it%2Fl330w2jaqusb1.jpg&imgrefurl=https%3A%2F%2Fwww.reddit.com%2Fr%2Fhalo%2Fcomments%2F172hyrd%2Fnoble_6_was_only_22_during_the_events_of_halo%2F&docid=KCCHV4mB9bLSRM&tbnid=HNzZvz6OIvDYHM&vet=12ahUKEwjTyqqNnPqLAxUHQUEAHXzsIEcQM3oECBoQAA..i&w=1170&h=1631&hcb=2&ved=2ahUKEwjTyqqNnPqLAxUHQUEAHXzsIEcQM3oECBoQAA