The following is Feb. 6, 2024, the Defense Intelligence Agency report, Iran: Enabling Houthi Attacks Across the Middle East.
From the report
This product provides a visual comparison of Iranian missiles and weaponized unmanned aerial vehicles (UAVs) and those displayed and employed by Houthi forces in Yemen to attack civilian infrastructure across the region. Photographs of weapons displayed and fired by Iran and the Houthis, as well as those illegally smuggled aboard boats from Iran, strongly suggest their Iranian origin. Iranian aid has enabled the Houthis to initiate a campaign of missile and UAV attacks against commercial ships in the Red Sea since November 2023. As of mid-December 2023, several of the largest global shipping firms had suspended transit through the Red Sea, citing the risk.
Download the document here.