15 CFR § 701.2
Offsets. Compensation practices required as a condition of purchase in either government-to-government or commercial sales of:
(1) Defense articles and/or defense services as defined by the Arms Export Control Act and the International Traffic in Arms Regulations; or
(2) Items controlled under an Export Control Classification Number (ECCN) that has the numeral “6” as its third character in the Commerce Control List found in supplement no. 1 to part 774 of this chapter other than semi-submersible and submersible vessels specially designed for cargo transport and parts, components, accessories and attachments specially designed therefor controlled under ECCN 8A620.b; test, inspection and production equipment controlled in ECCN 8B620.b, software controlled in ECCN 8D620.b and technology controlled in ECCN 8E620.b.