Originally started to bring medical care to remote regions of underdeveloped countries, the organization has expanded to include the US as an area with insufficient medical care. The service is staffed by volunteer medical staff (unpaid) and they are personally flown into these areas by Stan.
So, it isn't that obscure, and as SpiritualFox points out, Doctors Without Borders is another group that does this as well.
Caption this Meme
