Who were the first SEALs primarily composed of?

The first SEALs were primarily composed of former UDT personnel, Navy divers, and experienced operators. This group was chosen due to their existing expertise in amphibious operations and their proficiency in underwater warfare, which were crucial for the newly formed SEAL teams. The combination of skills and experience from UDTs, who had already demonstrated their capabilities in World War II, laid a strong foundation for the SEALs as they took on more complex and diverse missions during the Vietnam War and beyond.

This background allowed the initial SEAL teams to leverage their specialized knowledge in challenging environments, ensuring they were well-prepared for the unique demands of naval special warfare. Utilizing experienced operators also facilitated a rapid transition into effective operational units rather than relying on fresh recruits who might need extensive training and experience to reach a comparable level of proficiency.