I want to know the answer to the following question:
Why did Iran have to build its own military hardware, vehicles, and weapons after the 1979 Revolution?
All the background I'm provided with is that "In recent years, official announcements have highlighted the development of weapons such as the Hoot, Kowsar, Zelzal, Fateh-110, Shahab-3 and Sejjil missiles, and a variety of unmanned aerial vehicles (UAVs).". Is that enough to answer the question?