Milestone A

Milestone A is the formal acquisition decision point in the DoD 5000 Series acquisition framework at which the Milestone Decision Authority (MDA) authorizes a defense program to enter the Technology Maturation and Risk Reduction (TMRR) phase, approving early technology development work and releasing competitive contracts to demonstrate and reduce technology and design risks before committing to engineering development.

What is Milestone A?

The DoD acquisition system divides major defense programs into sequential phases separated by milestone decision points designated as Milestone A, Milestone B, and Milestone C. Each milestone represents a formal decision by the MDA about whether to continue program investment and advance to the next phase, based on program performance, cost estimates, risk assessments, and strategic need.

Milestone A marks the transition from early pre-acquisition activities (concept refinement, market research, analysis of alternatives) into the Technology Maturation and Risk Reduction phase. The TMRR phase is characterized by competitive prototyping, the government typically awards multiple contracts to competing industry teams to mature alternative technology approaches, reduce technical risk, and generate data for the subsequent Milestone B decision.

The key documents reviewed at Milestone A include the Acquisition Strategy, which describes how the program will be managed and competed; the Analysis of Alternatives (AoA), which compares different approaches to meeting the military capability need; and the Technology Readiness Assessment, which evaluates whether the critical technologies are sufficiently mature for the proposed development approach.

For defense contractors, Milestone A is the entry point to formal competitive positions on major defense programs. Companies that received pre-Milestone A contracts for concept studies or technology demonstrations now compete for TMRR contracts. Losing the TMRR competition significantly reduces, though does not entirely eliminate, a company's chances of winning the eventual Milestone B production contract. The Milestone A decision also triggers a requirement for the program to maintain an independent cost estimate, setting expectations for future program budget submissions.

Why Milestone A matters for defense contractors

Milestone A marks the beginning of the funded, formal competition for a major defense program. Contractors that are not positioned at Milestone A, lacking either the technology demonstrations or the customer relationships developed during pre-Milestone A activities, start the TMRR phase at a competitive disadvantage.

Example

The Army issues a Milestone A decision for a new vehicle-mounted directed energy weapons program. Two competing industry teams (each comprising a prime and key technology subcontractors) are awarded 24-month TMRR contracts. Each team must demonstrate key technology components, provide preliminary design specifications, and submit program cost estimates. The Army's program office evaluates technical progress quarterly, with the Milestone B decision anticipated in 30 months. The team that demonstrates higher technical maturity and more credible cost estimates at Milestone B will receive the Engineering and Manufacturing Development (EMD) contract.

Frequently Asked Questions

Is Milestone A required for every defense acquisition program?

No. Milestone A is typically required for Major Defense Acquisition Programs (MDAPs) and Major Automated Information Systems (MAIS). Programs using Adaptive Acquisition Framework (AAF) pathways other than the Major Capability Acquisition pathway, such as the Software Acquisition Pathway or the Middle Tier of Acquisition, may not have a formal Milestone A. DoDI 5000.02 specifies which programs require formal milestone decisions.

What is the difference between the pre-Milestone A phase and the TMRR phase?

Pre-Milestone A activities (sometimes called "Materiel Solution Analysis") include concept studies, market research, analysis of alternatives, and early prototyping, usually funded through S&T (science and technology) accounts. These activities are not yet formal acquisition programs. After Milestone A, the program enters the formal acquisition baseline, has a Program Manager, has an approved acquisition strategy, and has formal cost, schedule, and performance parameters.

Can a program skip Milestone A?

Yes. Some programs may enter the acquisition system at Milestone B if technologies are sufficiently mature (technology readiness levels of 6 or higher) and the risk reduction typically done in TMRR is not needed. Programs entering at Milestone B without a preceding TMRR phase are sometimes called "direct to Milestone B" programs. The MDA makes this determination based on the AoA findings and technology maturity assessments.

Who approves Milestone A decisions for MDAPs?

For programs designated as Major Defense Acquisition Programs (with expected costs exceeding $480M in R&D or $2.79B in procurement), the milestone decision authority is the Under Secretary of Defense for Acquisition and Sustainment (USD(A&S)). For programs below the MDAP threshold, the Service Acquisition Executive or a delegated official typically serves as the MDA.