When Team Rubicon volunteers first arrived at the Navajo Nation in Kayenta , Arizona , this spring they had no idea it would be the organization ' s largest medical operation to date . Or , that it would be the beginning of what is likely to become a whole new service sector for Team Rubicon : providing medical support and relief within the United States , not just internationally . Those volunteers — or Greyshirts — also had no idea how many lives they ’ d touch . That was in early April . By the time the group demobilized in mid-July , much had changed .