Oofta your character is rich!
Lieutenant Drake was the military Attache from the United States and was assigned as part of the America's bridge staff, head of security. His job was to make sure nobody got any bad ideas during the months aboard the ship. Although lucky for him, good chunks of the trip would be spent asleep to minimize supply consumption. You just don't know what someone might do when placed in a confined space in the middle of empty nothing.
As the ship prepared for departure, Drake made final attendance calls through the living quarters, taking inventory of the passengers and crew. He had already stopped and checked in with the America's high value guest, a CEO of an Engineering corporation who thought Mars was his next big payday. He never did like those big corporate billionaires. Next on his list was a civilian who paid quite an awful lot to get a seat on the ship. A million U.S. dollars just to travel like this for 6 months and then become a colonist. Drake would have kept the money and settled down personally.