This compliance proceeding under Article 21.5 of the DSU concerned measures taken by the United States to implement the recommendations and rulings of the Dispute Settlement Body (DSB) in US–Tuna II (Mexico). In US–Tuna II (Mexico), the DSB found that certain US measures concerning the importation, marketing, and sale of tuna products (taken together, the Original Tuna Measure) were inconsistent with the Agreement on Technical Barriers to Trade (the TBT Agreement). The Original Tuna Measure, inter alia, contained conditions under which tuna products could be labelled ‘dolphin safe’. The United States' measure taken to comply with the recommendations and rulings of the DSB consisted of an amendment to the Original Tuna Measure (the 2013 Final Rule). The Appellate Body generally referred to the Original Tuna Measure, together with the 2013 Final Rule, as the Amended Tuna Measure. The Amended Tuna Measure was the focus of this compliance proceeding.