The Pentagon's fastest-growing acquisition instrument is, by legal definition, not a contract at all. Under 10 U.S.C. § 4022, the Department of Defense can fund prototype projects through "other transactions" (OTs) — agreements that sit outside the Federal Acquisition Regulation and most of the procurement statutes layered on top of it. The money has followed the flexibility: GAO reported in September 2025 that OT obligations grew from $1.8 billion in fiscal year 2016 to more than $18 billion in fiscal year 2024, a tenfold expansion in eight years. For small and mid-sized firms, OTs are now one of the most realistic paths into defense work — if you understand the statute's peculiar entry conditions and unusual protest rules.

Born Outside the FAR: The Statutory Basis

OTs are defined in the negative. Two statutes matter. 10 U.S.C. § 4021 authorizes "transactions (other than contracts, cooperative agreements, and grants)" for basic, applied, and advanced research. Section 4022 extends that authority to prototype projects — and, critically, to follow-on production — for DARPA, the Defense Innovation Unit, the military departments, and other designated officials. The lineage is older than most assume: DoD's Other Transactions Guide traces the concept to NASA's founding statute in 1958, with DARPA's prototype authority arriving in the FY1994 defense bill.

Because an OT is not a procurement contract, grant, or cooperative agreement, any statute or regulation applying solely to those instruments does not apply. That means no FAR clauses by default, no Competition in Contracting Act structure, and no Contract Disputes Act forum. The exemption is not total: the OT Guide is emphatic that appropriations, security, and export-control law still bind the parties, prototype OTs remain subject to the Procurement Integrity Act, and the Guide states that competitive procedures are required "to the maximum extent practicable." Agencies design their own competitions; they do not skip them.

The Price of Admission: Nontraditionals, Small Businesses, or Cost-Share

Congress attached strings to the prototype authority. Under section 4022(d), an agency may use an OT only if at least one condition holds: a nontraditional defense contractor or nonprofit research institution participates "to a significant extent"; all significant participants are small businesses or nontraditional contractors; at least one-third of total project cost comes from non-federal sources; or the senior procurement executive makes an exceptional-circumstances determination. Oversight scales with size: projects between $100 million and $500 million need a written determination by the head of the contracting activity; above $500 million, senior-procurement-executive approval plus congressional notification.

The pivotal term, "nontraditional defense contractor," is more generous than it sounds. Under the definition at 10 U.S.C. § 3014, a firm qualifies if it has not performed, in the year before solicitation, any DoD contract or subcontract subject to full Cost Accounting Standards coverage. Because CAS exempts small-business awards, commercial contracts, and competed firm-fixed-price work, the Guide notes that "nearly all small business concerns" qualify — including companies that work exclusively for DoD. Most small contractors count as nontraditional, and the one-third cost-share requirement never enters the picture.

From Prototype to Production Without a New Competition

Section 4022(f) is the commercial heart of the authority: a follow-on production OT or contract may be awarded without further competition if the original prototype OT was competitively awarded and the prototype was successfully completed. The OT Guide defines success as meeting a project's key technical goals, satisfying success metrics written into the agreement, or achieving a favorable result that justifies transition.

The mechanics are unforgiving. In its May 2018 Oracle decision, GAO sustained the protest of the Army's $950 million follow-on production OT to REAN Cloud because the prototype agreement itself never provided for follow-on production and the prototype work was not complete at award. Agencies must paper the follow-on path into the original agreement, and performers should insist on it — the production option is where prototype work becomes a business.

Consortia: How Small Firms Actually Get In

Most small firms encounter OTs not through a direct solicitation but through consortia — technology-focused membership organizations that hold a base OT agreement with a DoD customer and pass individual project awards to members. GAO found that DoD used 28 consortia in fiscal years 2019 through 2021, administered by one of four management organizations, and that consortia accounted for over $24 billion in obligations — nearly two-thirds of all prototype OT dollars in that period. The largest covered medical defense ($8.0 billion), armaments ($5.0 billion), and aviation and missiles ($2.6 billion).

Joining is a commercial act: the OT Guide notes consortium arrangements are commercial agreements to which DoD is not necessarily a party, typically run by a consortium manager or lead member. In practice, a member pays dues, watches the consortium's pipeline of requests for solutions, and submits white papers — a far shorter path than a FAR Part 15 proposal. GAO also flagged that DoD has collected only limited information on consortium managers' compensation, so factor fees into your bid math.

Protests: A Narrow Door at GAO, a Wider One in Court

Losing an OT competition rarely gives you a GAO remedy. In Oracle, GAO restated that it does not review the merits of OT awards; it will hear only a timely protest that an agency is improperly using its OT authority — asking whether the exercise of that discretion was "knowing and authorized," not whether the evaluation was fair. The Court of Federal Claims has moved the other way: in Raytheon Co. v. United States (February 2025), the court held that OT award protests fall within its Tucker Act jurisdiction as matters "in connection with a procurement," positioning itself as the de facto forum for OT protests.

What It Means for Contractors

First, check your status: if you hold no fully CAS-covered DoD work, you are a nontraditional contractor and satisfy section 4022(d) on your own — lead with that in every submission. Second, join the consortia matching your technology area before you need them; two-thirds of prototype OT money flows through those pipes, and membership is the price of seeing the solicitations. Third, negotiate the follow-on production clause into the prototype agreement itself — Oracle shows what happens when it is missing — and get success metrics defined in writing, since they trigger your sole-source production award. Fourth, GAO reported prototype OTs at more than $16 billion in FY2024 against $2 billion in production OTs, and many programs shift to FAR contracts for production: treat the prototype as an audition for a longer, more regulated relationship. Finally, if an award goes wrong, do not reflexively file at GAO — the Court of Federal Claims is where OT protests now live.

Sources