Why does Iranian acquisition of ballistic missiles or Iran's pursuit of a space launch capability matter, especially to the Congress? For decades, most in Congress have viewed Iran with concern because of its nuclear program and its support of anti-U.S. and anti-Israel militant movements in the region. Although it is not certain that Iran has made the decision to develop a nuclear weapon, it is taking steps to drastically reduce the time needed to obtain nuclear weapons should a decision be made to do so. It is the prospect of an Iranian nuclear weapon mated to an effective missile delivery capability that is especially worrisome to most. This book examines the current and prospective Iranian capabilities that challenge U.S. national security interests, with a focus on its ballistic missile and space launch programs.