# § 3451. Definitions
In this chapter:
**(1)** The terms “commercial product”, “commercial service”, “nondevelopmental item”, “component”, and “commercial component” have the meanings provided in sections 103, 103a, 110, 105, and 102, respectively, of title 41.
**(2)** The term “head of an agency” means the Secretary of Defense, the Secretary of Homeland Security, and the Administrator of the National Aeronautics and Space Administration.
**(3)** The term “agency” means the Department of Defense, the Coast Guard, and the National Aeronautics and Space Administration.
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**Source Credit**: (Added Pub. L. 103–355, title VIII, § 8103, Oct. 13, 1994, 108 Stat. 3390, § 2376; amended Pub. L. 107–107, div. A, title X, § 1048(a)(19), Dec. 28, 2001, 115 Stat. 1223; Pub. L. 107–296, title XVII, § 1704(b)(1), Nov. 25, 2002, 116 Stat. 2314; Pub. L. 111–350, § 5(b)(22), Jan. 4, 2011, 124 Stat. 3844; Pub. L. 115–232, div. A, title VIII, § 836(d)(2), Aug. 13, 2018, 132 Stat. 1866; renumbered § 3451 and amended Pub. L. 116–283, div. A, title XVIII, § 1821(a)(2), (b)(1)(A), Jan. 1, 2021, 134 Stat. 4195.)
## Editorial Notes
### Prior Provisions
A prior section 3451, , , provided that an officer who is promoted to a temporary grade is considered to have accepted his promotion on the date of the order announcing it, unless he expressly declines the promotion, prior to repeal by , title VII, § 701, , , 2955, effective .
### Amendments
2021—, transferred this section so as to precede section 3452 and appear at the beginning of this chapter.
, renumbered as this section.
2018—Par. (1). substituted “terms ‘commercial product’, ‘commercial service’,” for “terms ‘commercial item’,” and “sections 103, 103a, 110, 105, and 102, respectively, of title 41” for “chapter 1 of title 41”.
2011—Par. (1). substituted “chapter 1 of title 41” for “section 4 of the Office of Federal Procurement Policy Act ()”.
2002—Par. (2). substituted “of Homeland Security” for “of Transportation”.
2001—Par. (1). inserted “()” after “section 4 of the Office of Federal Procurement Policy Act”.
## Statutory Notes and Related Subsidiaries
### Effective Date of 2021 Amendment
Amendment by effective , with additional provisions for delayed implementation and applicability of existing law, see , set out as a note preceding .
### Effective Date of 2018 Amendment
Amendment by effective , subject to a savings provision, see , set out as an Effective Date of 2018 Amendment; Savings Provision note under , Domestic Security.
### Effective Date of 2002 Amendment
Amendment by effective on the date of transfer of the Coast Guard to the Department of Homeland Security, see , set out as a note under .