Significantly, the United States Military Forces have withstood several challenges from across the border all through the history of the nation. The U.S. military, today, has become the most influential military body in international affairs and it possesses one of the largest militaries in the world in terms of number of personnel. The role of the U.S. military in the contemporary world of terrorism and nuclear threats has increased tremendously and the international community has great hope and trust in the ability of the U.S. military in countering the threats raised by the advocates of terrorism. In a reflective exploration of the historical development of the U.S. military in the recent years, it becomes lucid that the single most influential episode affecting the nature of the operations and functions of the U.S. military in the contemporary world has been launched by the September 11 attacks on the World Trade Center and Pentagon in 2001. In other words, one of the most important influences on the nature of the operations and functions of the U.S. military in the recent years has been the Global War on Terror (otherwise known as the War on Terror or the War on Terrorism) which refers to the ongoing international military campaign against global terrorism. As the United States of America leads the Global War on Terror (GWoT), with the support of the United Kingdom and other NATO and non-NATO countries, the role of the U.S. military is essential in any strategies to counter terrorist developments in the world. Significantly, the Global War on Terrorism, which was formally launched in 2001 with the invasion of Afghanistan by the U.S.-led international forces, has influenced the nature of operations and functions of the U.S. military. Thus, the impact of Global War on Terror (GWoT) on the U.S. Military in the recent years offers a highly promising area of research in connection with History and Military Studies.