The Iranian-supported Houthis still possess a large arsenal of sophisticated weapons despite weeks of regular U.S. strikes, according to U.S. defense officials.

The Houthis, a Yemeni rebel group that holds territory in the western part of the country, have carried out dozens of missile and drone attacks on commercial vessels transiting the Red Sea and Gulf of Aden. Houthi attacks began in mid-November and they cited Israel’s war in Gaza against Hamas as their motivation, while the U.S. first responded militarily last month. They’ve carried out strikes regularly since then.