In 1958, George Kistiakowsky, a key Manhattan Project scientist and Science Advisor in the Eisenhower Administration, suggested to the President that inspection of foreign military facilities was not sufficient to control their nuclear weapons. Kistiakowsky was particularly concerned with the difficulty of verifying the number, type, and deployment of nuclear-armed missiles on missile submarines, and proposed that the arms control strategy focus on disarmament rather than inspections. He was also concerned with the short warning times available from intercontinental ballistic missile (ICBM) launches, which took away the lengthy decision time available when the nuclear threat came exclusively from manned bombers.