The top U.S. military commander Adm. Brad Cooper visited the USS Lincoln as reports have emerged of mental health and supply issues. The Lincoln arrived in the Middle East in January and has been supporting the U.S. war against Iran, including the blockade on Iranian ports. It has spent a record-setting uninterrupted time at sea of more than 240 days.

“History will record this deployment as one of the most operationally intense and consequential of the modern era,” Cooper said of the Lincoln strike group in a statement released Saturday. Extended deployments of carriers — which can have more than 5,000 sailors and Marines on board — have raised concerns.