Columbia University is one of the world’s most important centers of research and at the same time a distinctive and distinguished learning environment for undergraduates and graduate students in many scholarly and professional fields. The University recognizes the importance of its location in New York City and seeks to link its research and teaching to the vast resources of a great metropolis. It seeks to attract a diverse and international faculty and student body, to support research and teaching on global issues, and to create academic relationships with many countries and regions. It expects all areas of the University to advance knowledge and learning at the highest level and to convey the products of its efforts .
Shortly after these early commencement ceremonies, classes were interrupted by war. During World War I, the university allowed the U.S. military to use some of its grounds for testing. In 1917, the U.S. military divided American University into two segments, Camp American University and Camp Leach. Camp American University became the birthplace of the United States’ chemical weapons program and the site of chemical weapons testing; this required a major cleanup effort in the 1990s. Camp Leach was home to advanced research, development, and testing of modern camouflage techniques. As of 2014, the Army Corps of Engineers was still removing ordnance including mustard gas and mortar shells.