US warships in the Red Sea have been engaging in battles with Houthi forces in Yemen, shooting down drones and protecting commercial ships. The US Navy has not disclosed the specific weapon systems being used, but experts believe they include surface-to-air missiles, explosive shells, and close-in weapons systems. However, the cost of intercepting drones with expensive missiles may become a concern as the Houthi attacks continue. The US Navy's ability to protect merchant ships and replenish missile inventory in the region is also a challenge. The US-led operation to expand the number of warships protecting merchant vessels, called Operation Prosperity Guardian, aims to address these issues and receive international support. The experts suggest that striking the source of the attacks may be a more cost-effective approach in the long run.