10 U.S.C. § 3309

(a) Definition.—

In this section, the term “proposal” means any proposal, including a technical, management, or cost proposal, submitted by a contractor in response to the requirements of a solicitation for a competitive proposal.

(b) Prohibition.—

Except as provided in subsection (c), a proposal in the possession or control of an agency named in section 3063 of this title may not be made available to any person under section 552 of title 5 .

(c) Inapplicability.—

Subsection (b) does not apply to any proposal that is set forth or incorporated by reference in a contract entered into between the Department and the contractor that submitted the proposal.