It's the difference between conventional and unconventional warfare. Tables of Oganization and Equipment (TO&E) differ as does the approach to the misson.
While many of us have always regarded our jarhead friends as "special", they have been a conventional force.
Probably time for a complete reorganization of all the forces; there seems to be a lot of duplication among the different branches of service.
I stand corrected on my understanding of Recon.