The Department of Defense, through the Marine Corps Installations National Capital Region-Regional Contracting Office (MCINCR-RCO), is seeking proposals for Professional Support Services for the Marine Corps Center for Lessons Learned (MCCLL) at Quantico, Virginia. This follow-on contract will be a 100% 8(a) small business set-aside and will include a hybrid structure of Firm Fixed-Price (FFP) for services and Cost Reimbursement for travel and other direct costs, with a performance period consisting of a 12-month base and four 12-month option periods. The services are critical for program management, lessons learned support, data analysis, and content management, requiring a SECRET Facility Clearance Level for handling classified information. Proposals are due by December 15, 2025, at 4:00 PM EST, and interested parties can contact Christian Hernandez-Soto at christian.hernandezsoto@usmc.mil or Edgar Lopez-Jimenez at edgar.lopezjimenez@usmc.mil for further information.