In which conflict were SEAL Team One and Two first tested?

SEAL Team One and Two were first tested during the Vietnam War, which marks a critical period in the development and operational capacity of the U.S. Navy's SEALs. Established in 1962, these teams were created to conduct unconventional warfare, counterinsurgency, and special reconnaissance missions in response to the growing need for specialized forces during the conflict in Vietnam.

During this war, the SEALs conducted a variety of missions that involved direct action against enemy forces, espionage, and support for South Vietnamese troops. Operations such as riverine warfare, interdiction against the Ho Chi Minh Trail, and reconnaissance missions showcased the SEALs' unique capabilities and adaptability in combat situations that were suitable for their training and skill set.

The other conflicts listed did not see the implementation and testing of the SEAL Teams in the same formative manner. While the Korean War predates the establishment of the SEALs, the Gulf War and the Afghanistan War had SEAL teams involved, those came later when the units had already been fully developed and saw established roles within the broader structure of naval special warfare. Therefore, the Vietnam War was pivotal in shaping the identity and operational methods of SEAL Team One and Two.