What is the difference between the MRA and NASAR?

The MRA and NASAR are very similar in purpose and functionality.

The MRA tends to focus on search and rescue operations in mountainous environments, while NASAR is designed for broader range of search and rescue needs.

Another difference is the MRA certifies the SAR team and then each SAR team certifies it's own members, while NASAR certifies the individuals, not the teams.