The first step is to become a Marine.
The prerequisites for CSOs and SOOs are:
- Have a minimum GT score of 105 for enlisted, or GTC of 110 for officers.
- Have a minimum PFT of 235.
- Be able to pass the MARSOC swim assessment.
- Meet the MARSOC medical screening criteria.
- Be eligible to obtain and maintain a secret clearance.
- Be willing and able, upon selection, to make a lateral move to the critical skills operator MOS.