April 21, 20121 – RAT-SAR signed an MOU (Memorandum of Understanding) with Huntsville Cave Rescue Unit (HCRU) to provide mutual aid for search and rescue operations. HCRU has existed since 1955 and is one of the best equipped and capable cave rescue units in the country. The MOU will greatly expand the capabilities of both HCRU and RAT-SAR to respond to search and rescue events in North Alabama.