Click the picture for Google driving directions to OCS for Graduation or Check in Officer Candidates School is located on Marine Corps Base (MCB) Quantico. Quantico is located in Northern Virginia, near Prince William County. It is accessible from Interstate 95 of HWY 1. Quantico is South of Washington D.C. and north of Fredericksburg, Va. There are two exits on both North and Southbound lanes … Continue reading Driving Directions to USMC OCS Graduation