From the Overview: "On January 7, 2020, Iran launched 16 short-range ballistic missiles that were fired from three different locations inside the country and hit various targets on two Iraqi military installations housing U.S. troops--Al Asad Air Base and an air base near Erbil in Northern Iraq. [...] Iran has been acquiring, developing, and testing its ballistic missile capabilities for decades and continues to invest in developing ballistic missiles and in building an extensive network of related facilities. The recent attack may have demonstrated advances in the accuracy of Iran's missiles. Short- and medium-range ballistic missile tests indicate that Iran is focused on increasing the accuracy of its missiles. Once forecasted to acquire an intercontinental-range ballistic missile by 2020, Iran has not yet demonstrated this capacity. Furthermore, Iran's space launch program continues to experience significant delays, and may be slowing."
CRS In Focus, IF10938
Congressional Research Service: https://crsreports.congress.gov/