The Alsos Mission was commanded by Colonel Boris Pash, a former Manhattan Project security officer. Samuel Goudsmit was its scientific leader. It was jointly staffed by the Office of Naval Intelligence (ONI), the Office of Scientific Research and Development (OSRD), the Manhattan Project, and Army Intelligence (G-2), to investigate enemy scientific developments. It was not restricted to those involving nuclear weapons, but also investigated chemical and biological weapons, and the means to deliver them.