DP World has been certified as a partner in the Customs-Trade Partnership Against Terrorism (C‑TPAT) initiative by U.S. Customs and Border Protection – to date, the only international port operator to have achieved this recognition. This certification is primarily based on DP World's commitment to the independently audited international ISO 28000 security standards. DP World was the first global maritime terminal operator to achieve ISO 28000 supply chain security certification and is rolling out the standard to all its terminals.[22]