Looks good - but I believe that the MARS units should be either air-mobile or be able to call on air support (if only for MEDEVAC).
And, if you'll forgive the "vanity post" I have 2 candidates for aircraft that could be assigned to work with your proposed MARS unit
http://morrow-industries.com/morrow-project-blog/?p=296
http://morrow-industries.com/morrow-project-blog/?p=224