LMSC Montana Information on USMS.org
The US Masters Swimming website has a section for each Local Masters Swim Club.
USMS writes:
When you become a member of USMS, in addition to registering with a club, workout group, or as unattached, you also become a member of your Local Masters Swimming Committee. Your LMSC is a regional governing body that provides certain benefits to USMS members, including printed registration cards, event sanctions, newsletters about activities within the LMSC, websites, awards and recognition, and social activities. Your LMSC officers are local volunteers who attend the USMS annual meeting, sit on USMS national committees, and vote on policies that set the overall direction for USMS.