The answer used to be Yes for reserve, No for active. Active duty had to be assessed and selected prior to going through the training pipeline. Now, there is an option for initial entry to complete OSUT as an MP and then move on to be assessed and selected to complete the training pipeline. Talk to your recruiter if you haven't already started the process. Active duty has many more opportunities for career advancement and assignments than reserves. Additionally, active duty 37F only support SOF units (SF, Seals, MARSOC, etc), whereas reserve units mostly support conventional units.
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