The MSA is the Maine Snowmobile Association . . . a group that is an advocate for the activity of snowmobiling in Maine. They produce a monthly newsletter and are directly involved with legislation pertaining to snowmobiling and public land access.
Scott and MSA also happen to be two of the leading manufacturers of air packs that firefighters (and other safety professionals) use when entering environments where the person needs to have their own breathable air (i.e. smoky environment, low oxygen environment, etc.)