Certain missiles are a type of long-range ballistic missile. The most well-known of these missiles are the Titan, SAM, and Thor missiles. The Titan is a two-stage intercontinental ballistic missile developed by the United States in the 1960s. The SAM is a short-range surface-to-air missile developed by the Soviet Union in the 1950s. The Thor is a medium-range ballistic missile developed by the United States in the 1950s. All three of these missiles have been used in various military conflicts throughout the years.