Quoted from the front page of the website
"Our Mission ... to raise the physical, mental, social, and spiritual health of American Indians and Alaska Natives to the highest level.
Our Goal ... to assure that comprehensive, culturally acceptable personal and public health services are available and accessible to American Indian and Alaska Native people."
The membership consists of American natives who would like to receive the benefits of this organization. To be eligible to be a member you must be "an Indian and/or Alaskan Native" evidenced by several factors including being a part of a tribe, living on reservation land, or living in the household of a native. The employees consist of federal healthcare professionals commissioned by the United States Public Health Service and Civil Service federal employees.
Representatives of the Indian Health Service have made numerous congressional testimonies and numerous pieces of legislation have been passes to support the IHS, however, it does not appear that any relate to emergency response or disaster.
The IHS mainly focuses on disaster prevention and preparedness with initiatives such as teaching children about illness prevention, teaching about safe drinking water and food safety, preventing the spread of disease, and preventing injuries. They also have a number of resources available to their members to connect with healthcare professionals. This seems to be a community awareness type approach that prevents the spread of disease by teaching the community. It resembles that of many healthcare systems and does not seem to suggest problems with other approaches.