Ras Isa is a critical oil pipeline and port, one of three on the country’s west coast through which the vast majority of imports and humanitarian assistance enter Yemen. Central Command argued the Iran-backed Houthi rebels, which America considers a terrorist group, were using the site as a fuel supply facility and for graft.

Review of targets, policy, frequency and intensity shows renewed battle against Iran-backed rebels is completely different under new administration, but critics say problems remain