Defense Contracting: How DoD Procurement Works
The Department of Defense operates the largest procurement enterprise in the federal government, obligating over $400 billion annually to acquire weapons systems, information technology, logistics support, and professional services (USASpending.gov, FY2023 federal contract data). DoD procurement follows a distinct regulatory framework layered atop the Federal Acquisition Regulation, with defense-specific requirements that differ substantially from civilian agency contracting. Understanding how these rules interact — from solicitation to contract closeout — is foundational for any firm pursuing defense work. This page covers the definition and scope of defense contracting, the step-by-step acquisition process, common contract scenarios, and the decision points that determine which rules apply.
Definition and scope
Defense contracting refers to the procurement of goods, services, and research by the Department of Defense and its component agencies — including the Army, Navy, Air Force, Marine Corps, Space Force, Defense Logistics Agency (DLA), Defense Advanced Research Projects Agency (DARPA), and the Missile Defense Agency (MDA), among others.
The legal foundation rests on two regulatory frameworks:
- The Federal Acquisition Regulation (FAR) — the government-wide procurement rulebook codified at 48 C.F.R. Chapter 1, which applies to all federal acquisitions.
- The Defense Federal Acquisition Regulation Supplement (DFARS) — DoD-specific rules codified at 48 C.F.R. Chapter 2, which supplement and in some cases override FAR provisions.
DFARS requirements address issues particular to defense acquisitions: handling of Controlled Unclassified Information (CUI), cybersecurity obligations under DFARS 252.204-7012, safety requirements for certain munitions work, and restrictions on foreign-sourced materials under the Berry Amendment (10 U.S.C. § 4862).
The scope of DoD procurement spans four broad categories:
- Major Defense Acquisition Programs (MDAPs) — programs with estimated costs exceeding $480 million in research and development or $2.79 billion in procurement, as defined by 10 U.S.C. § 4201.
- Weapon systems and platform sustainment — maintenance, repair, and overhaul contracts for aircraft, ships, vehicles, and ordnance.
- Services — professional, technical, and advisory services acquired through vehicles such as Indefinite Delivery/Indefinite Quantity (IDIQ) contracts.
- Research and Development — contracts under research and development vehicles including Other Transaction Authority (OTA) agreements, which are explicitly exempt from FAR and DFARS.
How it works
DoD acquisition follows a structured lifecycle governed by DoD Instruction 5000.02 and the Adaptive Acquisition Framework (AAF), which the Office of the Under Secretary of Defense for Acquisition and Sustainment published to replace the single-path acquisition model.
The procurement sequence follows these steps:
- Requirements determination — A requiring activity (a military unit, program office, or DoD agency) identifies a need and documents it in a requirements package, often including a Statement of Work (SOW), Statement of Objectives (SOO), or Performance Work Statement (PWS).
- Acquisition planning — The contracting officer develops an acquisition plan addressing contract type, competition strategy, small business considerations, and any applicable set-aside designations.
- Market research — Conducted under FAR Part 10, market research determines whether commercial items, small businesses, or existing contract vehicles (such as GSA Schedules) can satisfy the requirement.
- Solicitation — A Request for Proposal (RFP) is issued, typically posted to beta.SAM.gov. The solicitation identifies evaluation factors, proposal submission requirements, and applicable contract clauses.
- Proposal evaluation and source selection — Offerors submit technical and price proposals. Source selection evaluates proposals against stated factors, which may be weighted toward technical merit, past performance, or price depending on the acquisition.
- Award and administration — After award, a Contracting Officer's Representative (COR) monitors contractor performance. Costs may be audited by the Defense Contract Audit Agency (DCAA).
- Closeout — Contract closeout procedures under FAR 4.804 verify that all deliverables are accepted, final invoices paid, and applicable audit findings resolved. Contract closeout procedures can extend years beyond the period of performance on cost-reimbursement awards.
Common scenarios
Competitive sealed bidding vs. negotiated procurement
Competitive sealed bidding (FAR Part 14) uses Invitations for Bid (IFBs), awards to the lowest responsive and responsible bidder, and permits no post-submission negotiations. This method suits construction and supply contracts with clear, measurable specifications. Negotiated procurement (FAR Part 15) — used for the majority of defense services and complex systems — allows evaluation of technical approach and past performance alongside price, and permits discussions before final offer submission.
Small business set-asides in DoD
DoD is subject to the same small business set-aside rules as civilian agencies but operates under additional goals. The Small Business Administration and DoD jointly set annual small business prime contracting goals; DoD's goal for small business participation is set at 22.5% of eligible prime contract dollars (SBA goaling program). Firms pursuing set-asides must verify their North American Industry Classification System (NAICS) eligibility through NAICS codes for government contractors before submitting proposals.
Cybersecurity requirements
Any contractor handling Federal Contract Information (FCI) or CUI under a DoD contract must comply with DFARS 252.204-7012 and, under the phased rollout of the Cybersecurity Maturity Model Certification (CMMC) 2.0 program, must achieve a verified compliance level before award. Level 2 (Advanced) requires 110 security practices aligned to NIST SP 800-171. For a detailed breakdown, see CMMC certification requirements.
Subcontracting in defense contracts
Prime contractors on contracts exceeding $750,000 (or $1.5 million for construction) must submit a subcontracting plan under FAR 52.219-9, establishing percentage goals for work awarded to small business categories. Requirements for these plans are detailed at subcontracting plans requirements.
Decision boundaries
Several threshold-based rules determine which procurement procedures apply to a given defense acquisition:
| Threshold | Rule Triggered |
|---|---|
| Micro-purchase: ≤$10,000 | No competition requirement; card purchase permitted (FAR 13.201) |
| Simplified acquisition: $10,001–$250,000 | FAR Part 13 simplified procedures; set-aside for small business required if two or more capable firms exist |
| Competitive negotiation: >$250,000 | Full FAR Part 15 procedures; written acquisition plan required |
| Truth in Negotiations Act (TINA): ≥$2 million | Contractor must certify and submit cost or pricing data (10 U.S.C. § 3702) |
| MDAP threshold: R&D >$480M or procurement >$2.79B | Congressional reporting, milestone reviews, and Selected Acquisition Report (SAR) required |
Fixed-price vs. cost-reimbursement contracts represent the most consequential decision boundary in defense contracting. Fixed-price contracts transfer cost risk to the contractor; cost-reimbursement contracts (governed by FAR Part 31 allowable cost rules) transfer risk to the government but require extensive accounting system compliance, including Cost Accounting Standards (CAS) compliance for contracts over $2 million. Contractors new to cost-reimbursement work must establish compliant accounting systems before award — a process reviewed by DCAA.
For a broader orientation to government procurement vehicles and contractor registration requirements, see the Government Contractor Authority reference guide, which covers the full landscape of federal acquisition from initial SAM registration through post-award compliance.