Canada’s contribution to the Mars project is primarily the supply ship Calgary. Only carrying two colonists, the Calgary is for freight and little else. As a result, the crew of the Calgary are exactly that. The Jamaican Supply Sergeant, Darice Koffee and RCMP Staff Sergeant Jasper Freedman are those two special passengers actually going to Mars.
These are the brave men and women assigned to man stations on the ships, ferrying the… Wait. Not so brave supplies that have no clue where they’re headed… Oh. And two brave men, to Mars.
These are all the necessities it was felt were needed on Mars colony. The weight of generic supplies that takes the place of the weight of colonists and their children or possessions.