The U.S. government has given more than $500 million in military aid to Yemen since 2007. With the country in turmoil, U.S. officials fear some of it may have fallen into the hands of the Houthis, an Iranian-backed militia, or factions allied with al-Qaeda. Meanwhile, thePentagon has halted several aid packages that were in the works. Here’s some of what has been approved or delivered since 2010. Related story.