(a) In General.—In carrying out authorities provided to the Secretary to design, construct, accept, or otherwise acquire assets and systems under section 501(d), the Secretary, acting through the Commandant or the head of an integrated program office established for a major acquisition program, may enter into contracts for a major acquisition program.

(b) Authorized Methods.—Contracts entered into under subsection (a)—

(1) may be block buy contracts;

(2) may be incrementally funded;

(3) may include combined purchases, also known as economic order quantity purchases, of—

(A) materials and components; and

(B) long lead time materials; and

(4) as provided in section 2306b of title 10, may be multiyear contracts.

(c) Subject to Appropriations.—Any contract entered into under subsection (a) shall provide that any obligation of the United States to make a payment under the contract is subject to the availability of amounts specifically provided in advance for that purpose in subsequent appropriations Acts.