OSO: Officer Selection Officer Marine recruiters come in two categories: generic “Recruiters” usually refers to those serving the Enlisted Marine pipeline. An “Officer Recruiter” is an OSO, or Officer Selection Officer. He works out of an OSO…the Officer Selection Office. How to Contact an OSO This is where the confusion comes from. You might find OSO contact information online or at your college, but it’s … Continue reading How Do I Find a Marine Officer Recruiter? (Hint, it’s an “OSO”)