How do I bid on Department of Defense contracts?
DoD contracts are competed through SAM.gov (like all federal), the Defense Logistics Agency's DIBBS system for military parts, and various service-specific vehicles. You need SAM.gov registration, likely a CAGE code (automatic with SAM), often a facility clearance, and awareness of Defense Federal Acquisition Regulation Supplement (DFARS) requirements.
The U.S. Department of Defense is by far the largest federal buyer, spending roughly $400 billion annually on contracts across the Army, Navy, Air Force, Marines, Space Force, and defense agencies (DLA, DISA, DARPA, and others). DoD-specific procurement follows federal contracting rules with additional DoD-only supplements.
Entry point one: SAM.gov. All DoD opportunities above the simplified acquisition threshold appear here alongside civilian federal opportunities — filter by "Department: DoD" or specific components (Army, Navy, etc.) to see just DoD. SAM.gov registration is required to bid — the process assigns you a Unique Entity Identifier and a Commercial And Government Entity (CAGE) code that specifically identifies you to DoD systems.
Entry point two: DIBBS (DLA Internet Bid Board System) at dibbs.bsm.dla.mil. This is the Defense Logistics Agency's dedicated system for automated small-parts solicitations — National Stock Numbers (NSNs) for physical goods the military uses in enormous volume (bolts, filters, uniforms, food, medical supplies). DIBBS releases thousands of small solicitations per week, most under $25,000. You need a separate DIBBS account beyond your SAM registration.
Entry point three: service-specific vehicles. The Army has SEC (Software Engineering Center) contracts and DHITS for IT. The Navy has SeaPort-NxG for professional services and NAVSEA for engineering. The Air Force has various NETCENTS and Alliant vehicles. Each service also runs specific competitions for major programs.
DoD-specific requirements to know: DFARS clauses supplement FAR clauses — most DFARS clauses are strict about "Buy American" and specialty metals sourcing (rules apply to steel, titanium, and other materials that must originate in the U.S. or a qualifying country). CMMC (Cybersecurity Maturity Model Certification) is being phased in — small defense contractors handling Controlled Unclassified Information will need CMMC Level 1 or 2 depending on the contract by 2026-2028. NIST 800-171 compliance is already required for controlled unclassified information handling.
Facility clearances are required for classified work but NOT for most unclassified DoD contracts. Sponsorship for a Facility Security Clearance (FCL) must come from a cleared prime or the government agency itself — you cannot self-apply. Most small businesses start with unclassified work, build a track record, and pursue clearance only when a specific opportunity requires it.
Practical strategy for new-to-DoD contractors: start with DIBBS small-value NSN buys to build past performance and DoD-specific record. Register as a subcontractor to established primes on the SB.gov and PIEE (Procurement Integrated Enterprise Environment) systems. Attend one of the DoD Office of Small Business Programs (OSBP) matchmaking events — every DoD service has one, and they are free ways to meet contracting officers directly.