W66 (nuclear warhead)

The W66 is a type of thermonuclear (fusion) warhead developed by the United States during the Cold War. It was designed primarily for use with the U.S. Navy's Poseidon missile system. Here are some key details about the W66: 1. **Design and Type**: The W66 is a high-yield thermonuclear warhead, which means it uses both fission and fusion processes to produce an explosive yield.